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-rw-r--r--pkgs/development/compilers/z88dk/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/compilers/z88dk/default.nix b/pkgs/development/compilers/z88dk/default.nix
index 19056ec2b6fd..433b6e6b32cb 100644
--- a/pkgs/development/compilers/z88dk/default.nix
+++ b/pkgs/development/compilers/z88dk/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
   #_FORTIFY_SOURCE requires compiling with optimization (-O)
   NIX_CFLAGS_COMPILE = "-O";
 
-  short_rev = "${builtins.substring 0 7 src.rev}";
+  short_rev = builtins.substring 0 7 src.rev;
   makeFlags = [
     "git_rev=${short_rev}"
     "version=${version}"