diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 0ff53c9..897ce41 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -15,7 +15,7 @@ jobs:
     
     strategy:
       matrix:
-        os: [macos-14, ubuntu-24.04]
+        os: [ubuntu-24.04]
         compiler_suite: [clang, gcc]
 
     steps:
diff --git a/ex/memory_checks_cpp/array.cc b/ex/memory_checks_cpp/array.cc
index 4c86fc2..60ceb44 100644
--- a/ex/memory_checks_cpp/array.cc
+++ b/ex/memory_checks_cpp/array.cc
@@ -124,21 +124,21 @@ void double_delete_array (void) {
 
 void non_malloc_free (void) {
     int a = 10;
-    int * p;
+    int * p = nullptr;
     if (a < 20) p = &a;
     std::free (p);
 }
 
 void non_new_delete (void) {
     int a = 10;
-    int * p;
+    int * p = nullptr;
     if (a < 20) p = &a;
     delete p;
 }
 
 void non_new_array_delete (void) {
     int a = 10;
-    int * p;
+    int * p = nullptr;
     if (a < 20) p = &a;
     delete[] p;