diff --git a/cc/config/global.go b/cc/config/global.go
index dcc7719..b19682d 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -245,6 +245,7 @@
 		"-Werror=int-to-pointer-cast",
 		"-Werror=pointer-to-int-cast",
 		"-Werror=xor-used-as-pow",
+		"-Wimplicit-int-float-conversion",
 		// http://b/161386391 for -Wno-void-pointer-to-enum-cast
 		"-Wno-void-pointer-to-enum-cast",
 		// http://b/161386391 for -Wno-void-pointer-to-int-cast