diff --git a/configure.ac b/configure.ac
index f60b2a07c56..656ad79ad0b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -461,9 +461,9 @@ AC_CHECK_TYPES([socklen_t], [], [], [
 ])
 
 dnl These are defined elsewhere than stdio.h.
-PHP_CHECK_SIZEOF(intmax_t, 0)
-PHP_CHECK_SIZEOF(ssize_t, 8)
-PHP_CHECK_SIZEOF(ptrdiff_t, 8)
+PHP_CHECK_SIZEOF([intmax_t], [0])
+PHP_CHECK_SIZEOF([ssize_t], [8])
+PHP_CHECK_SIZEOF([ptrdiff_t], [8])
 
 dnl Check stdint types (must be after header check).
 PHP_CHECK_STDINT_TYPES