diff --git a/fmt/format.cc b/fmt/format.cc
index 2d236bc6..f5481fbb 100644
--- a/fmt/format.cc
+++ b/fmt/format.cc
@@ -161,7 +161,7 @@ int safe_strerror(
             ERANGE : result;
     }
 
-#ifdef __c2__
+#ifdef __clang__
 # pragma clang diagnostic push
 # pragma clang diagnostic ignored "-Wdeprecated-declarations"
 #endif
@@ -173,7 +173,7 @@ int safe_strerror(
       return errno;
     }
 
-#ifdef __c2__
+#ifdef __clang__
 # pragma clang diagnostic pop
 #endif