diff --git a/configure.ac b/configure.ac
index 3cdb527..4b74b70 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,8 +164,8 @@ AC_ARG_ENABLE(valgrind,
 USE_VALGRIND="0"
 if test "x$with_valgrind" = "xyes"; then
     AC_CHECK_HEADER([valgrind/valgrind.h],
-	AC_CHECK_DECLS([VALGRIND_PRINTF_BACKTRACE],
-	    USE_VALGRIND="1",,[#include <valgrind/valgrind.h>]))
+	[AC_CHECK_DECLS([VALGRIND_PRINTF_BACKTRACE],
+	    [USE_VALGRIND="1"],,[#include <valgrind/valgrind.h>])])
 fi
 AC_SUBST(USE_VALGRIND)