diff --git a/openssl-sys/src/crypto.rs b/openssl-sys/src/crypto.rs
index bdc0add15..7eff6a847 100644
--- a/openssl-sys/src/crypto.rs
+++ b/openssl-sys/src/crypto.rs
@@ -57,7 +57,7 @@ pub type CRYPTO_EX_free = unsafe extern "C" fn(
     argp: *mut c_void,
 );
 
-#[cfg(ossl110)]
+#[cfg(any(ossl110, libressl390))]
 #[inline]
 #[track_caller]
 pub unsafe fn OPENSSL_malloc(num: usize) -> *mut c_void {
@@ -68,7 +68,7 @@ pub unsafe fn OPENSSL_malloc(num: usize) -> *mut c_void {
     )
 }
 
-#[cfg(not(ossl110))]
+#[cfg(not(any(ossl110, libressl390)))]
 #[inline]
 #[track_caller]
 pub unsafe fn OPENSSL_malloc(num: c_int) -> *mut c_void {
@@ -79,7 +79,7 @@ pub unsafe fn OPENSSL_malloc(num: c_int) -> *mut c_void {
     )
 }
 
-#[cfg(ossl110)]
+#[cfg(any(ossl110, libressl390))]
 #[inline]
 #[track_caller]
 pub unsafe fn OPENSSL_free(addr: *mut c_void) {
@@ -90,7 +90,7 @@ pub unsafe fn OPENSSL_free(addr: *mut c_void) {
     )
 }
 
-#[cfg(not(ossl110))]
+#[cfg(not(any(ossl110, libressl390)))]
 #[inline]
 pub unsafe fn OPENSSL_free(addr: *mut c_void) {
     CRYPTO_free(addr)
diff --git a/openssl-sys/src/handwritten/crypto.rs b/openssl-sys/src/handwritten/crypto.rs
index 62ccbce1e..0b3f24a42 100644
--- a/openssl-sys/src/handwritten/crypto.rs
+++ b/openssl-sys/src/handwritten/crypto.rs
@@ -57,7 +57,7 @@ extern "C" {
 }
 
 cfg_if! {
-    if #[cfg(ossl110)] {
+    if #[cfg(any(ossl110, libressl390))] {
         extern "C" {
             pub fn CRYPTO_malloc(num: size_t, file: *const c_char, line: c_int) -> *mut c_void;
             pub fn CRYPTO_free(buf: *mut c_void, file: *const c_char, line: c_int);