diff --git a/src/webui/extjs.c b/src/webui/extjs.c
index 58b9cc81..7b5041cb 100644
--- a/src/webui/extjs.c
+++ b/src/webui/extjs.c
@@ -152,7 +152,7 @@ extjs_root(http_connection_t *hc, const char *remain, void *opaque)
 		 "\tpadding:0;\n"
 		 "\tborder:0 none;\n"
 		 "\toverflow:hidden;\n"
-		 "\theight:100%;\n"
+		 "\theight:100%%;\n"
 		 "}\n"
 		 "#systemlog {\n"
 		 "\tfont:normal 12px courier; font-weight: bold;\n"