diff --git a/pkgs/by-name/ch/cheesecutter/1001-cheesecutter-Pin-C-standard-to-C99.patch b/pkgs/by-name/ch/cheesecutter/1001-cheesecutter-Pin-C-standard-to-C99.patch
new file mode 100644
index 000000000000..3a7575c7219e
--- /dev/null
+++ b/pkgs/by-name/ch/cheesecutter/1001-cheesecutter-Pin-C-standard-to-C99.patch
@@ -0,0 +1,58 @@
+From 91e2418c37fce511eeaa1d1bb34a0d7a25668d40 Mon Sep 17 00:00:00 2001
+From: OPNA2608 <opna2608@protonmail.com>
+Date: Tue, 20 Jan 2026 15:29:03 +0100
+Subject: [PATCH] Makefile.{dmd,ldc}: Pin C standard to C99
+
+Code is definitely not C23-compatible, and I imagine C99 is *prolly* what this was initially targeting.
+---
+ Makefile.dmd | 4 ++--
+ Makefile.ldc | 4 ++--
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/Makefile.dmd b/Makefile.dmd
+index 24a1d06..7c1b7c2 100644
+--- a/Makefile.dmd
++++ b/Makefile.dmd
+@@ -3,7 +3,7 @@ COMFLAGS=
+ DLINK=$(COMFLAGS) 
+ VERSION=$(shell cat Version)
+ DFLAGS=$(COMFLAGS) -I./src -J./src/c64 -J./src/font -O
+-CFLAGS=$(COMFLAGS) -O1
++CFLAGS=$(COMFLAGS) -O1 -std=c99
+ CXXFLAGS=-I./src -O3
+ COMPILE.d = $(DC) $(DFLAGS) -c -of$@
+ OUTPUT_OPTION=
+@@ -21,7 +21,7 @@ $(TARGET): $(C64OBJS) $(OBJS) $(CXX_OBJS)
+ 	$(CXX) $(CXXFLAGS) -c $< -o $@
+ 
+ .c.o : $(C_SRCS)
+-	$(CC) -c $< -o $@
++	$(CC) $(CFLAGS) -c $< -o $@
+ 
+ ct: $(C64OBJS) $(CTOBJS)
+ 
+diff --git a/Makefile.ldc b/Makefile.ldc
+index b89077a..a6c4714 100644
+--- a/Makefile.ldc
++++ b/Makefile.ldc
+@@ -6,7 +6,7 @@ LIBS=-L-ldl -L-lstdc++
+ COMFLAGS=-O2
+ VERSION=$(shell cat Version)
+ DFLAGS=$(COMFLAGS) -I./src -J./src/c64 -J./src/font
+-CFLAGS=$(COMFLAGS)
++CFLAGS=$(COMFLAGS) -std=c99
+ CXXFLAGS=$(COMFLAGS) -I./src 
+ COMPILE.d = $(DC) $(DFLAGS) -c
+ DC=ldc2
+@@ -28,7 +28,7 @@ ccutter:$(C64OBJS) $(OBJS) $(CXX_OBJS)
+ 	$(CXX) $(CXXFLAGS) -c $< -o $@
+ 
+ .c.o : $(C_SRCS)
+-	$(CC) -c $< -o $@
++	$(CC) $(CFLAGS) -c $< -o $@
+ 
+ ct: $(C64OBJS) $(CTOBJS)
+ 
+-- 
+2.51.2
+
diff --git a/pkgs/by-name/ch/cheesecutter/package.nix b/pkgs/by-name/ch/cheesecutter/package.nix
index 42531867b15c..36b59414cdcd 100644
--- a/pkgs/by-name/ch/cheesecutter/package.nix
+++ b/pkgs/by-name/ch/cheesecutter/package.nix
@@ -19,6 +19,9 @@ stdenv.mkDerivation {
   };
 
   patches = [
+    # https://github.com/theyamo/CheeseCutter/pull/60
+    ./1001-cheesecutter-Pin-C-standard-to-C99.patch
+
     ./0001-Drop-baked-in-build-date-for-r13y.patch
   ]
   ++ lib.optional stdenv.hostPlatform.isDarwin ./0002-Prepend-libSDL.dylib-to-macOS-SDL-loader.patch;