diff --git a/legacy/eina/src/lib/eina_prefix.c b/legacy/eina/src/lib/eina_prefix.c
index 4bd6be0233..c830def34f 100644
--- a/legacy/eina/src/lib/eina_prefix.c
+++ b/legacy/eina/src/lib/eina_prefix.c
@@ -30,17 +30,15 @@
 #endif
 #ifdef HAVE_ALLOCA_H
 # include <alloca.h>
-#elif defined __GNUC__
-# ifndef alloca
+#elif !defined alloca
+# ifdef __GNUC__
 #  define alloca __builtin_alloca
-# endif
-#elif defined _AIX
-# define alloca __alloca
-#elif defined _MSC_VER
-# include <malloc.h>
-# define alloca _alloca
-#else
-# ifndef HAVE_ALLOCA
+# elif defined _AIX
+#  define alloca __alloca
+# elif defined _MSC_VER
+#  include <malloc.h>
+#  define alloca _alloca
+# elif !defined HAVE_ALLOCA
 #  ifdef  __cplusplus
 extern "C"
 #  endif