diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 7eb75cd7993..fc30f6a3bfe 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,7 @@
+2012-03-13  Tristan Gingold  <gingold@adacore.com>
+
+	* gcc-interface/gigi.h (flag_vms_malloc64): Refine condition.
+
 2012-03-13  Tristan Gingold  <gingold@adacore.com>
 
 	* sysdep.c: Adjust condition after removal of __osf__.
diff --git a/gcc/ada/gcc-interface/gigi.h b/gcc/ada/gcc-interface/gigi.h
index 5b95f9c6b98..8a83647bce4 100644
--- a/gcc/ada/gcc-interface/gigi.h
+++ b/gcc/ada/gcc-interface/gigi.h
@@ -995,10 +995,12 @@ extern void enumerate_modes (void (*f) (const char *, int, int, int, int, int,
    intrusive preprocessor directives.  */
 #ifndef TARGET_ABI_OPEN_VMS
 #define TARGET_ABI_OPEN_VMS 0
+#endif
 
 /* VMS option set by default, when clear forces 32bit mallocs and 32bit
-   Descriptors. Always used in combination with TARGET_ABI_OPEN_VMS
+   Descriptors.  Always used in combination with TARGET_ABI_OPEN_VMS
    so no effect on non-VMS systems.  */
+#if TARGET_ABI_OPEN_VMS == 0
 #define flag_vms_malloc64 0
 #endif