diff --git a/src/core/PICA/gpu.cpp b/src/core/PICA/gpu.cpp
index a3163f86..51e9ab69 100644
--- a/src/core/PICA/gpu.cpp
+++ b/src/core/PICA/gpu.cpp
@@ -23,6 +23,7 @@ void GPU::reset() {
 	shaderJIT.reset();
 	std::memset(vram, 0, vramSize);
 	lightingLUT.fill(0);
+	lightingLUTDirty = true;
 
 	totalAttribCount = 0;
 	fixedAttribMask = 0;