diff --git a/common.gypi b/common.gypi
index 7819816bbb..c57cc5b7b3 100644
--- a/common.gypi
+++ b/common.gypi
@@ -56,7 +56,7 @@
     'configurations': {
       'Debug': {
         'variables': {
-          'v8_enable_handle_zapping%': 1,
+          'v8_enable_handle_zapping': 1,
         },
         'defines': [ 'DEBUG', '_DEBUG' ],
         'cflags': [ '-g', '-O0' ],
@@ -83,7 +83,7 @@
       },
       'Release': {
         'variables': {
-          'v8_enable_handle_zapping%': 0,
+          'v8_enable_handle_zapping': 0,
         },
         'cflags': [ '-O3', '-ffunction-sections', '-fdata-sections' ],
         'conditions': [