diff --git a/pkgs/tools/compression/hactool/default.nix b/pkgs/tools/compression/hactool/default.nix
index c6e0a3a2851b..2e6e7437fff2 100644
--- a/pkgs/tools/compression/hactool/default.nix
+++ b/pkgs/tools/compression/hactool/default.nix
@@ -11,11 +11,14 @@ stdenv.mkDerivation rec {
     sha256 = "0305ngsnwm8npzgyhyifasi4l802xnfz19r0kbzzniirmcn4082d";
   };
 
+  patches = [ ./musl-compat.patch ];
+
   preBuild = ''
     mv config.mk.template config.mk
   '';
 
   makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
+  enableParallelBuilding = true;
 
   installPhase = ''
     install -D hactool $out/bin/hactool
diff --git a/pkgs/tools/compression/hactool/musl-compat.patch b/pkgs/tools/compression/hactool/musl-compat.patch
new file mode 100644
index 000000000000..37d596f183fb
--- /dev/null
+++ b/pkgs/tools/compression/hactool/musl-compat.patch
@@ -0,0 +1,13 @@
+diff --git a/main.c b/main.c
+index 07f53cb..f2265df 100644
+--- a/main.c
++++ b/main.c
+@@ -369,7 +369,7 @@ int main(int argc, char **argv) {
+                     return EXIT_FAILURE;
+                 }
+                 nca_ctx.tool_ctx->base_file_type = BASEFILE_FAKE;
+-                nca_ctx.tool_ctx->base_file++; /* Guarantees base_file != NULL. I'm so sorry. */
++                if (!nca_ctx.tool_ctx->base_file) nca_ctx.tool_ctx->base_file = (FILE*) 1;
+                 break;
+             case 32:
+                 tool_ctx.action |= ACTION_ONLYUPDATEDROMFS;