diff --git a/pkgs/by-name/pd/pdfcpu/package.nix b/pkgs/by-name/pd/pdfcpu/package.nix
index 7a55adc0ed1f..1b7500e5d4f8 100644
--- a/pkgs/by-name/pd/pdfcpu/package.nix
+++ b/pkgs/by-name/pd/pdfcpu/package.nix
@@ -77,7 +77,7 @@ buildGoModule (finalAttrs: {
       if stdenv.hostPlatform.isDarwin then "Library/Application Support" else ".config"
     }"/pdfcpu
     versionOutput="$($out/bin/pdfcpu version)"
-    for part in ${finalAttrs.version} $(cat COMMIT | cut -c1-8) $(cat SOURCE_DATE); do
+    for part in ${finalAttrs.version} $(cut -c1-8 COMMIT) $(cat SOURCE_DATE); do
       if [[ ! "$versionOutput" =~ "$part" ]]; then
           echo version output did not contain expected part $part . Output was:
           echo "$versionOutput"