diff --git a/pkgs/development/libraries/mbedtls/default.nix b/pkgs/development/libraries/mbedtls/default.nix
index 057e86945298..90e2c9bd9a73 100644
--- a/pkgs/development/libraries/mbedtls/default.nix
+++ b/pkgs/development/libraries/mbedtls/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
   '';
 
   cmakeFlags = [ "-DUSE_SHARED_MBEDTLS_LIBRARY=on" ];
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [
     "-Wno-error=format"
     "-Wno-error=format-truncation"
   ];