diff --git a/toolkit/mozapps/update/updater/updater-common.build b/toolkit/mozapps/update/updater/updater-common.build
index 73543e27d8c6..4eb7e9ff114e 100644
--- a/toolkit/mozapps/update/updater/updater-common.build
+++ b/toolkit/mozapps/update/updater/updater-common.build
@@ -117,3 +117,7 @@ elif CONFIG['OS_ARCH'] == 'WINNT':
 if 'gtk' in CONFIG['MOZ_WIDGET_TOOLKIT']:
     CXXFLAGS += CONFIG['TK_CFLAGS']
     OS_LIBS += CONFIG['TK_LIBS']
+
+if CONFIG['CC_TYPE'] == 'gcc':
+    CXXFLAGS += ['-Wno-format-truncation']
+