diff --git a/binding.gyp b/binding.gyp
index 32a7626..026abe6 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -25,7 +25,7 @@
               "GCC_SYMBOLS_PRIVATE_EXTERN": "YES", # -fvisibility=hidden
             },
         }],
-        ['generate_coverage="yes"', {
+        ['generate_coverage=="yes"', {
             "cflags+": ["--coverage"],
             "cflags_cc+": ["--coverage"],
             "linkflags+": ["--coverage"],