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-rw-r--r--assert/assert.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/assert/assert.h b/assert/assert.h
index 9908d4176a..b511d116d9 100644
--- a/assert/assert.h
+++ b/assert/assert.h
@@ -89,7 +89,7 @@ __END_DECLS
    enough estimate for when the feature became available.  */
 # if __GNUC_PREREQ (3, 0)
 #  define assert(expr) \
-  (__ASSERT_VOID_CAST (__builtin_expect (expr, 1) ? 0 :			      \
+  (__ASSERT_VOID_CAST (__builtin_expect (!!(expr), 1) ? 0 :		      \
 		       (__assert_fail (__STRING(expr), __FILE__, __LINE__,    \
 				       __ASSERT_FUNCTION), 0)))
 # else