diff --git a/pkgs/by-name/ti/tilem/gcc15-fix.patch b/pkgs/by-name/ti/tilem/gcc15-fix.patch
new file mode 100644
index 000000000000..6a76170739cf
--- /dev/null
+++ b/pkgs/by-name/ti/tilem/gcc15-fix.patch
@@ -0,0 +1,12 @@
+Fix call to zero-argument tilem_macro_new(), which GCC 15 rejects because the declaration takes no parameters.
+--- a/gui/macro.c
++++ b/gui/macro.c
+@@ -70,7 +70,7 @@
+ 	tilem_macro_finalize(emu->macro);
+ 
+ 	/* Then allocate a new one */	
+-	emu->macro = tilem_macro_new(emu);
++	emu->macro = tilem_macro_new();
+ }
+ 
+ /* Add an action to the macro. The action could be :
diff --git a/pkgs/by-name/ti/tilem/package.nix b/pkgs/by-name/ti/tilem/package.nix
index eed7018514df..5bc6a6468d19 100644
--- a/pkgs/by-name/ti/tilem/package.nix
+++ b/pkgs/by-name/ti/tilem/package.nix
@@ -27,7 +27,10 @@ stdenv.mkDerivation (finalAttrs: {
     libticables2
     libticalcs2
   ];
-  patches = [ ./gcc14-fix.patch ];
+  patches = [
+    ./gcc14-fix.patch
+    ./gcc15-fix.patch
+  ];
   env.NIX_CFLAGS_COMPILE = toString [ "-lm" ];
   meta = {
     homepage = "http://lpg.ticalc.org/prj_tilem/";