diff --git a/Source/Game-Lib/Game-Lib/Input/InputActionSystem.h b/Source/Game-Lib/Game-Lib/Input/InputActionSystem.h
index 500fe7f..8b5a077 100644
--- a/Source/Game-Lib/Game-Lib/Input/InputActionSystem.h
+++ b/Source/Game-Lib/Game-Lib/Input/InputActionSystem.h
@@ -368,8 +368,13 @@ class InputActionSystem
     struct PersistedBindingOverride
     {
     public:
+        // GCC rejects default member initializers on nested types when a member of the
+        // enclosing class needs them before the class is complete (gcc bug 96645), so
+        // initialize via the constructor instead
+        PersistedBindingOverride() : present(false) {}
+
         std::optional<InputBinding> binding;
-        bool present = false;
+        bool present;
     };
 
     using PersistedActionOverrides = std::array<PersistedBindingOverride, InputActionDesc::MAX_BINDINGS>;