diff --git a/pkgs/development/libraries/gnutls/default.nix b/pkgs/development/libraries/gnutls/default.nix
index 2b3e873cc59d..bec366b8e168 100644
--- a/pkgs/development/libraries/gnutls/default.nix
+++ b/pkgs/development/libraries/gnutls/default.nix
@@ -47,7 +47,7 @@ stdenv.mkDerivation {
     sed '/^void doit(void)/,/^{/ s/{/{ exit(77);/' -i tests/{trust-store,psk-file}.c
     sed 's:/usr/lib64/pkcs11/ /usr/lib/pkcs11/ /usr/lib/x86_64-linux-gnu/pkcs11/:`pkg-config --variable=p11_module_path p11-kit-1`:' -i tests/p11-kit-trust.sh
   '' + lib.optionalString stdenv.hostPlatform.isMusl '' # See https://gitlab.com/gnutls/gnutls/-/issues/945
-    sed '2iecho "certtool tests skipped in musl build"\nexit 0' -i tests/cert-tests/certtool
+    sed '2iecho "certtool tests skipped in musl build"\nexit 0' -i tests/cert-tests/certtool.sh
   '';
 
   preConfigure = "patchShebangs .";