diff --git a/pkgs/looking-glass-client/default.nix b/pkgs/looking-glass-client/default.nix
index 47cb112..e16d31b 100644
--- a/pkgs/looking-glass-client/default.nix
+++ b/pkgs/looking-glass-client/default.nix
@@ -103,6 +103,12 @@ stdenv.mkDerivation (finalAttrs: {
     ++ lib.optionals (!pulseSupport) ["-DENABLE_PULSEAUDIO=no"]
     ++ lib.optionals (!pipewireSupport) ["-DENABLE_PIPEWIRE=no"];
 
+  # GCC can warn about maybe-uninitialized inside vendored nanosvg and Looking
+  # Glass treats warnings as errors, which breaks the build.
+  NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [
+    "-Wno-error=maybe-uninitialized"
+  ];
+
   postUnpack = ''
     echo ${finalAttrs.src.rev} > source/VERSION
     export sourceRoot="source/client"