diff --git a/configure.ac b/configure.ac
index 2d0c871..8cda8e0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -518,21 +518,27 @@ AC_MSG_RESULT([$ivdep])
 
 # Checking ALIGNED
 
-AC_MSG_CHECKING([for aligned_alloc])
+AC_MSG_CHECKING([for posix_memalign])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <stdlib.h>
+#include <stdio.h>
 ]], [[
     int main() {
-        void * pointer = aligned_alloc(64, 100);
-        free(pointer);
-        return 0;
+      void *ptr;
+      int ret = posix_memalign(&ptr, 64, 1024);
+      if (ret != 0) {
+        return EXIT_FAILURE;
+      }
+      free(ptr);
+      return 0;
     }
 ]])],
-    [have_aligned_alloc=yes], [have_aligned_alloc=no
+    [have_posix_memalign=yes], [have_posix_memalign=no
 ])
-AS_IF([test "x$have_aligned_alloc" = "xyes"], [
-  AC_DEFINE([HAVE_ALIGNED_ALLOC], [1], [Define to 1 if you have the aligned_alloc function.])
+AS_IF([test "x$have_posix_memalign" = "xyes"], [
+  AC_DEFINE([HAVE_POSIX_MEMALIGN], [1], [Define to 1 if you have the posix_memalign function.])
 ])
-AC_MSG_RESULT([$have_aligned_alloc])
+AC_MSG_RESULT([$have_posix_memalign])
 
 aligned=""
 AC_MSG_CHECKING([for vector aligned pragma])
@@ -550,7 +556,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
     [aligned='_Pragma("vector aligned")'], [
 ])
 
-AS_IF([test "x$have_aligned_alloc" = "xno"], [
+AS_IF([test "x$have_posix_memalign" = "xno"], [
   aligned=""
 ])
 
diff --git a/org/qmckl_memory.org b/org/qmckl_memory.org
index 64c4a1c..d351fab 100644
--- a/org/qmckl_memory.org
+++ b/org/qmckl_memory.org
@@ -125,7 +125,7 @@ void* qmckl_malloc(qmckl_context context,
      ~qmckl_context~.
 
   4. The function then allocates memory:
-     If the ~HAVE_HPC~ and ~HAVE_ALIGNED_ALLOC~ macros are defined, the memory
+     If the ~HAVE_HPC~ and ~HAVE_POSIX_MEMALIGN~ macros are defined, the memory
      allocation is done using the ~aligned_alloc~ function with a 64-byte alignment,
      rounding up the requested size to the nearest multiple of 64 bytes. Else, the
      memory allocation is done using the standard ~malloc~ function.
@@ -153,11 +153,11 @@ void* qmckl_malloc(qmckl_context context, const qmckl_memory_info_struct info) {
   qmckl_context_struct* const ctx = (qmckl_context_struct*) context;
 
   /* Allocate memory and zero it */
-#if defined(HAVE_HPC) && defined(HAVE_ALIGNED_ALLOC)
-  assert( ((info.size+64) >> 6) << 6 >= info.size );
-  void * pointer = aligned_alloc(64, ((info.size+64) >> 6) << 6 );
+  void * pointer = NULL;
+#if defined(HAVE_HPC) && defined(HAVE_POSIX_MEMALIGN)
+  if (posix_memalign(&pointer, 64, info.size) != 0) pointer = NULL;
 #else
-  void * pointer = malloc(info.size);
+  pointer = malloc(info.size);
 #endif
   if (pointer == NULL) {
     return NULL;