diff --git a/cmake/randomx.cmake b/cmake/randomx.cmake
index c94c66d3..a50e078f 100644
--- a/cmake/randomx.cmake
+++ b/cmake/randomx.cmake
@@ -1,10 +1,16 @@
 if (WITH_RANDOMX)
-    include(CheckFunctionExists)
+    include(CheckSymbolExists)
 
-    check_function_exists(posix_memalign HAVE_POSIX_MEMALIGN)
-
-    if(HAVE_POSIX_MEMALIGN)
-        add_definitions(/DHAVE_POSIX_MEMALIGN)
+    if (WIN32)
+        check_symbol_exists(_aligned_malloc "stdlib.h" HAVE_ALIGNED_MALLOC)
+        if (HAVE_ALIGNED_MALLOC)
+            add_compile_definitions(HAVE_ALIGNED_MALLOC)
+        endif()
+    else()
+        check_symbol_exists(posix_memalign "stdlib.h" HAVE_POSIX_MEMALIGN)
+        if (HAVE_POSIX_MEMALIGN)
+            add_compile_definitions(HAVE_POSIX_MEMALIGN)
+        endif()
     endif()
 
     add_definitions(/DXMRIG_ALGO_RANDOMX)
diff --git a/src/crypto/randomx/intrin_portable.h b/src/crypto/randomx/intrin_portable.h
index 8ec8325e..7e3641ea 100644
--- a/src/crypto/randomx/intrin_portable.h
+++ b/src/crypto/randomx/intrin_portable.h
@@ -412,7 +412,7 @@ inline void* rx_aligned_alloc(size_t size, size_t align) {
     return 0;
 };
 #   define rx_aligned_free(a) free(a)
-#elif defined(_MSC_VER)
+#elif defined(HAVE_ALIGNED_MALLOC)
 #   define rx_aligned_alloc(a, b) _aligned_malloc(a, b)
 #   define rx_aligned_free(a) _aligned_free(a)
 #else
@@ -569,7 +569,7 @@ inline void* rx_aligned_alloc(size_t size, size_t align) {
     return 0;
 };
 #   define rx_aligned_free(a) free(a)
-#elif defined(_MSC_VER)
+#elif defined(HAVE_ALIGNED_MALLOC)
 #   define rx_aligned_alloc(a, b) _aligned_malloc(a, b)
 #   define rx_aligned_free(a) _aligned_free(a)
 #else