diff --git a/pkgs/build-support/gcc-wrapper2/default.nix b/pkgs/build-support/gcc-wrapper2/default.nix
index d517a472d74..950ba4c9f78 100644
--- a/pkgs/build-support/gcc-wrapper2/default.nix
+++ b/pkgs/build-support/gcc-wrapper2/default.nix
@@ -12,6 +12,7 @@
 assert nativeTools -> nativePrefix != "";
 assert !nativeTools -> gcc != null && binutils != null;
 assert !nativeLibc -> libc != null;
+assert gcc != null;
 
 let