diff --git a/pkgs/by-name/c6/c64-debugger/package.nix b/pkgs/by-name/c6/c64-debugger/package.nix
index a39e0d274167..bb13dd188b3e 100644
--- a/pkgs/by-name/c6/c64-debugger/package.nix
+++ b/pkgs/by-name/c6/c64-debugger/package.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
   src = fetchgit {
     url = "https://git.code.sf.net/p/c64-debugger/code";
     rev = "f97772e3f5c8b4fa99e8ed212ed1c4cb1e2389f1";
-    sha256 = "sha256-3SR73AHQlYSEYpJLtQ/aJ1UITZGq7aA9tQKxBsn/yuc=";
+    hash = "sha256-3SR73AHQlYSEYpJLtQ/aJ1UITZGq7aA9tQKxBsn/yuc=";
   };
 
   buildInputs = [
@@ -85,10 +85,19 @@ stdenv.mkDerivation {
     runHook postInstall
   '';
 
-  meta = with lib; {
+  env = {
+    NIX_CFLAGS_COMPILE = toString [
+      "-Wno-error=narrowing"
+      "-Wno-error=implicit-function-declaration"
+      "-Wno-error=int-conversion"
+      "-Wno-error=incompatible-pointer-types"
+    ];
+  };
+
+  meta = {
     homepage = "https://sourceforge.net/projects/c64-debugger";
     description = "Commodore 64, Atari XL/XE and NES code and memory debugger that works in real time";
-    license = with licenses; [
+    license = with lib.licenses; [
       gpl3Only # c64-debugger
       mit # MTEngine
       # emulators included in c64-debugger
@@ -96,7 +105,7 @@ stdenv.mkDerivation {
       gpl2 # nestopiaue
     ];
     mainProgram = "c64debugger";
-    maintainers = [ maintainers.detegr ];
-    platforms = platforms.linux;
+    maintainers = [ lib.maintainers.detegr ];
+    platforms = lib.platforms.linux;
   };
 }