diff --git a/renderdoc/core/resource_manager.cpp b/renderdoc/core/resource_manager.cpp
index cb44f83c8..e934c307e 100644
--- a/renderdoc/core/resource_manager.cpp
+++ b/renderdoc/core/resource_manager.cpp
@@ -39,7 +39,10 @@ namespace ResourceIDGen
 		// separate replay IDs from live IDs by adding a value when replaying.
 		// 1000000000000000000 live IDs before we overlap replay IDs gives
 		// almost 32 years generating 100000 IDs per frame at 10000 FPS.
-		globalIDCounter = RDCMAX(uint64_t(globalIDCounter), uint64_t(globalIDCounter+1000000000000000000ULL));
+
+		// only add this value once (since we're not |'ing on a bit)
+		if(globalIDCounter < 1000000000000000000ULL)
+			globalIDCounter = RDCMAX(uint64_t(globalIDCounter), uint64_t(globalIDCounter+1000000000000000000ULL));
 	}
 };