diff --git a/pkgs/applications/audio/surge-XT/default.nix b/pkgs/applications/audio/surge-XT/default.nix
index 7c36c190128d..ccd5ad12c0e8 100644
--- a/pkgs/applications/audio/surge-XT/default.nix
+++ b/pkgs/applications/audio/surge-XT/default.nix
@@ -71,6 +71,11 @@ stdenv.mkDerivation rec {
     "-DSURGE_JUCE_PATH=${juce-lv2}"
   ];
 
+  CXXFLAGS = [
+    # GCC 13: error: 'uint32_t' has not been declared
+    "-include cstdint"
+  ];
+
   # JUCE dlopen's these at runtime, crashes without them
   NIX_LDFLAGS = (toString [
     "-lX11"
diff --git a/pkgs/applications/audio/zynaddsubfx/default.nix b/pkgs/applications/audio/zynaddsubfx/default.nix
index 2c8ecfd199e0..0060e8d4c7f4 100644
--- a/pkgs/applications/audio/zynaddsubfx/default.nix
+++ b/pkgs/applications/audio/zynaddsubfx/default.nix
@@ -94,6 +94,11 @@ in stdenv.mkDerivation rec {
     # Find FLTK without requiring an OpenGL library in buildInputs
     ++ lib.optional (guiModule == "fltk") "-DFLTK_SKIP_OPENGL=ON";
 
+  CXXFLAGS = [
+    # GCC 13: error: 'uint8_t' does not name a type
+    "-include cstdint"
+  ];
+
   doCheck = true;
   nativeCheckInputs = [ cxxtest ruby ];