diff --git a/src/allocator.h b/src/allocator.h
index ab35b4a6..305ab7e9 100644
--- a/src/allocator.h
+++ b/src/allocator.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_ALLOCATOR_H
-#define KMC_C90_COMPILER_ALLOCATOR_H
+#ifndef INCLUDE_GUARD_UUID_369AE7CB_59C4_44F9_827B_3680E4BE4CE3
+#define INCLUDE_GUARD_UUID_369AE7CB_59C4_44F9_827B_3680E4BE4CE3
 
 #include "utility.h"
 
@@ -10,4 +10,4 @@ void* allocate_container(AllocatorRef allocator);
 void* allocate_element(AllocatorRef allocator, size_t count);
 void deallocate(AllocatorRef allocator, void* ptr);
 
-#endif  /* KMC_C90_COMPILER_ALLOCATOR_H */
+#endif  /* INCLUDE_GUARD_UUID_369AE7CB_59C4_44F9_827B_3680E4BE4CE3 */
diff --git a/src/allocator_impl.h b/src/allocator_impl.h
index cf76e007..77c440b0 100644
--- a/src/allocator_impl.h
+++ b/src/allocator_impl.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_ALLOCATOR_IMPL_H
-#define KMC_C90_COMPILER_ALLOCATOR_IMPL_H
+#ifndef INCLUDE_GUARD_UUID_733C42B7_9635_4796_A825_357B2A199BA7
+#define INCLUDE_GUARD_UUID_733C42B7_9635_4796_A825_357B2A199BA7
 
 #include "utility.h"
 
@@ -10,4 +10,4 @@ struct Allocator {
   void (*deallocator_)(void* ptr, void* manager);
 };
 
-#endif  /* KMC_C90_COMPILER_ALLOCATOR_IMPL_H */
+#endif  /* INCLUDE_GUARD_UUID_733C42B7_9635_4796_A825_357B2A199BA7 */
diff --git a/src/ast.h b/src/ast.h
index 424a2620..9a1a2cde 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1,8 +1,8 @@
-#ifndef KMC_C90_COMPILER_AST_H
-#define KMC_C90_COMPILER_AST_H
+#ifndef INCLUDE_GUARD_UUID_1634E4AC_1406_46C3_9240_865975749754
+#define INCLUDE_GUARD_UUID_1634E4AC_1406_46C3_9240_865975749754
 
 enum AstTag {
   AST_IDENTIFIER
 };
 
-#endif  /* KMC_C90_COMPILER_AST_H */
+#endif  /* INCLUDE_GUARD_UUID_1634E4AC_1406_46C3_9240_865975749754 */
diff --git a/src/memory_pool.h b/src/memory_pool.h
index 1c8e220c..3b7f59b2 100644
--- a/src/memory_pool.h
+++ b/src/memory_pool.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_MEMORY_POOL_H
-#define KMC_C90_COMPILER_MEMORY_POOL_H
+#ifndef INCLUDE_GUARD_UUID_CE8F872C_1C85_4BD9_BA55_DCCB9DFCA5FD
+#define INCLUDE_GUARD_UUID_CE8F872C_1C85_4BD9_BA55_DCCB9DFCA5FD
 
 #include "utility.h"
 
@@ -16,4 +16,4 @@ void memory_pool_dtor(MemoryPoolRef* ppool);
 /* allocate 'size' memory from pool */
 void* palloc_impl(MemoryPoolRef pool, size_t size, size_t alignment);
 
-#endif  /* KMC_C90_COMPILER_MEMORY_POOL_H */
+#endif  /* INCLUDE_GUARD_UUID_CE8F872C_1C85_4BD9_BA55_DCCB9DFCA5FD */
diff --git a/src/sexpr.h b/src/sexpr.h
index 0261cbf4..e5f5de4e 100644
--- a/src/sexpr.h
+++ b/src/sexpr.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_SEXPR_H
-#define KMC_C90_COMPILER_SEXPR_H
+#ifndef INCLUDE_GUARD_UUID_DC32CCE0_A68D_4F17_8621_17C2E13F96F3
+#define INCLUDE_GUARD_UUID_DC32CCE0_A68D_4F17_8621_17C2E13F96F3
 
 #include "ast.h"
 #include "stdstring.h"
@@ -43,4 +43,4 @@ StringRef sexpr_get_symbol(SexprRef sexpr);
 SexprRef sexpr_make_ast(enum AstTag ast);
 enum AstTag sexpr_get_ast(SexprRef sexpr);
 
-#endif  /* KMC_C90_COMPILER_SEXPR_H */
+#endif  /* INCLUDE_GUARD_UUID_DC32CCE0_A68D_4F17_8621_17C2E13F96F3 */
diff --git a/src/sexpr_pool.h b/src/sexpr_pool.h
index aaacfdc8..fb80ec68 100644
--- a/src/sexpr_pool.h
+++ b/src/sexpr_pool.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_SEXPR_POOL_H
-#define KMC_C90_COMPILER_SEXPR_POOL_H
+#ifndef INCLUDE_GUARD_UUID_DD55EAEA_2431_4469_A0F8_24CDD9BF0180
+#define INCLUDE_GUARD_UUID_DD55EAEA_2431_4469_A0F8_24CDD9BF0180
 
 #include "allocator.h"
 #include "memory_pool.h"
@@ -10,4 +10,4 @@ void sexpr_finalize_pool(void);
 
 AllocatorRef sexpr_symbol_allocator(void);
 
-#endif  /* KMC_C90_COMPILER_SEXPR_POOL_H */
+#endif  /* INCLUDE_GUARD_UUID_DD55EAEA_2431_4469_A0F8_24CDD9BF0180 */
diff --git a/src/stdstring.h b/src/stdstring.h
index 394b96cd..b16e8ce8 100644
--- a/src/stdstring.h
+++ b/src/stdstring.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_STDSTRING_H
-#define KMC_C90_COMPILER_STDSTRING_H
+#ifndef INCLUDE_GUARD_UUID_AC04F0D5_11C0_431B_A82E_4E56DA9456AF
+#define INCLUDE_GUARD_UUID_AC04F0D5_11C0_431B_A82E_4E56DA9456AF
 
 #include "allocator.h"
 #include "utility.h"
@@ -114,4 +114,4 @@ size_t string_find_first_of(StringRef self, const char* str);
 /* behavior is undefined if str is NULL */
 size_t string_find_first_not_of(StringRef self, const char* str);
 
-#endif  /* KMC_C90_COMPILER_STDSTRING_H */
+#endif  /* INCLUDE_GUARD_UUID_AC04F0D5_11C0_431B_A82E_4E56DA9456AF */
diff --git a/src/stdstring_impl.h b/src/stdstring_impl.h
index 86f3bb52..f0e52d60 100644
--- a/src/stdstring_impl.h
+++ b/src/stdstring_impl.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_STDSTRING_IMPL_H
-#define KMC_C90_COMPILER_STDSTRING_IMPL_H
+#ifndef INCLUDE_GUARD_UUID_5C5CF2B9_E7DB_49BB_94B3_F1C9EEE856D8
+#define INCLUDE_GUARD_UUID_5C5CF2B9_E7DB_49BB_94B3_F1C9EEE856D8
 
 #include "allocator.h"
 #include "stdstring.h"
@@ -11,4 +11,4 @@ struct String {
   AllocatorRef allocator_;
 };
 
-#endif  /* KMC_C90_COMPILER_STDSTRING_IMPL_H */
+#endif  /* INCLUDE_GUARD_UUID_5C5CF2B9_E7DB_49BB_94B3_F1C9EEE856D8 */
diff --git a/src/use_vector.h b/src/use_vector.h
index 94b687d2..6543ae3b 100644
--- a/src/use_vector.h
+++ b/src/use_vector.h
@@ -1,6 +1,6 @@
-#ifndef KMC_C90_COMPILER_USE_VECTOR_H
-#define KMC_C90_COMPILER_USE_VECTOR_H
+#ifndef INCLUDE_GUARD_UUID_C9D4FBB0_D15A_468E_8F63_191FED23FD6B
+#define INCLUDE_GUARD_UUID_C9D4FBB0_D15A_468E_8F63_191FED23FD6B
 
 #include "vector.h"
 
-#endif  /* KMC_C90_COMPILER_USE_VECTOR_H */
+#endif  /* INCLUDE_GUARD_UUID_C9D4FBB0_D15A_468E_8F63_191FED23FD6B */
diff --git a/src/utility.h b/src/utility.h
index 3254de04..205b2c88 100644
--- a/src/utility.h
+++ b/src/utility.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_UTILITY_H
-#define KMC_C90_COMPILER_UTILITY_H
+#ifndef INCLUDE_GUARD_UUID_F5C18B91_A046_4615_A62F_B79EE7AED603
+#define INCLUDE_GUARD_UUID_F5C18B91_A046_4615_A62F_B79EE7AED603
 
 #include <stddef.h>
 
@@ -59,4 +59,4 @@ void memory_move(void* dst, const void* src, size_t size, size_t count);
 
 END_EXTERN_C
 
-#endif  /* KMC_C90_COMPILER_UTILITY_H */
+#endif  /* INCLUDE_GUARD_UUID_F5C18B91_A046_4615_A62F_B79EE7AED603 */
diff --git a/src/vector.h b/src/vector.h
index b993665c..590cba33 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_VECTOR_H
-#define KMC_C90_COMPILER_VECTOR_H
+#ifndef INCLUDE_GUARD_UUID_7DB59410_A810_40B5_BB5F_19CB9E822A40
+#define INCLUDE_GUARD_UUID_7DB59410_A810_40B5_BB5F_19CB9E822A40
 
 #include "utility.h"
 #include "allocator.h"
@@ -83,4 +83,4 @@
 
 #include "vector_impl.h"
 
-#endif  /* KMC_C90_COMPILER_VECTOR_H */
+#endif  /* INCLUDE_GUARD_UUID_7DB59410_A810_40B5_BB5F_19CB9E822A40 */
diff --git a/src/vector_impl.h b/src/vector_impl.h
index 887a5c7c..d5d58512 100644
--- a/src/vector_impl.h
+++ b/src/vector_impl.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_VECTOR_IMPL_H
-#define KMC_C90_COMPILER_VECTOR_IMPL_H
+#ifndef INCLUDE_GUARD_UUID_E601D647_8BA3_4262_B950_FE4DD1C72D12
+#define INCLUDE_GUARD_UUID_E601D647_8BA3_4262_B950_FE4DD1C72D12
 #include "allocator_impl.h"
 #include <assert.h>
 
@@ -252,4 +252,4 @@
     } \
   } \
 
-#endif  /* KMC_C90_COMPILER_VECTOR_IMPL_H */
+#endif  /* INCLUDE_GUARD_UUID_E601D647_8BA3_4262_B950_FE4DD1C72D12 */
diff --git a/tests/vector_test/use_vector.h b/tests/vector_test/use_vector.h
index bc5c1b4c..a2cb937e 100644
--- a/tests/vector_test/use_vector.h
+++ b/tests/vector_test/use_vector.h
@@ -1,5 +1,5 @@
-#ifndef KMC_C90_COMPILER_USE_VECTOR_H
-#define KMC_C90_COMPILER_USE_VECTOR_H
+#ifndef INCLUDE_GUARD_UUID_9515325F_50B2_4EC8_95E3_8B38BFCD1FDE
+#define INCLUDE_GUARD_UUID_9515325F_50B2_4EC8_95E3_8B38BFCD1FDE
 
 #include "utility.h"
 #include "vector.h"
@@ -8,4 +8,4 @@ BEGIN_EXTERN_C
 DECLARE_VECTOR(int)
 END_EXTERN_C
 
-#endif  /* KMC_C90_COMPILER_USE_VECTOR_H */
+#endif  /* INCLUDE_GUARD_UUID_9515325F_50B2_4EC8_95E3_8B38BFCD1FDE */
diff --git a/uuid-header.sh b/uuid-header.sh
new file mode 100755
index 00000000..c145efe1
--- /dev/null
+++ b/uuid-header.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+which uuidgen >/dev/null 2>&1 && {
+    uuidcmd='uuidgen -r'
+} || {
+    uuidcmd='uuid -v4'
+}
+
+for filename in "$@"
+do
+    uuid=$(${uuidcmd} | tr '[a-f-]' '[A-F_]')
+    macro="INCLUDE_GUARD_UUID_${uuid}"
+    ifndef="#ifndef ${macro}"
+    define="#define ${macro}"
+    endif="#endif  /* ${macro} */"
+    cat <<EOF >"${filename}"
+${ifndef}
+${define}
+
+${endif}
+EOF
+done