diff --git a/pkgs/development/libraries/libdevil/default.nix b/pkgs/development/libraries/libdevil/default.nix
index 2e3af6cbc471..63ca4877da65 100644
--- a/pkgs/development/libraries/libdevil/default.nix
+++ b/pkgs/development/libraries/libdevil/default.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation (finalAttrs: {
   enableParallelBuilding = true;
 
   postPatch = ''
-    for a in test/Makefile.in test/format_test/format_checks.sh.in ; do
+    for a in test/Makefile.am test/format_test/format_checks.sh.in ; do
       substituteInPlace $a \
         --replace /bin/bash ${runtimeShell}
     done