diff --git a/glx/glxdricommon.c b/glx/glxdricommon.c
index fc902729d..a97d027a8 100644
--- a/glx/glxdricommon.c
+++ b/glx/glxdricommon.c
@@ -132,7 +132,7 @@ createModeFromConfig(const __DRIcoreExtension * core,
     unsigned int attrib, value;
     int i;
 
-    config = malloc(sizeof *config);
+    config = calloc(1, sizeof *config);
 
     config->driConfig = driConfig;