diff --git a/src/blitter/32bpp_sse_func.hpp b/src/blitter/32bpp_sse_func.hpp
--- a/src/blitter/32bpp_sse_func.hpp
+++ b/src/blitter/32bpp_sse_func.hpp
@@ -154,7 +154,7 @@ static inline Colour AdjustBrightneSSE(C
 }
 
 GNU_TARGET(SSE_TARGET)
-static inline __m128i AdjustBrightnessOfTwoPixels(__m128i from, uint32_t brightness)
+static inline __m128i AdjustBrightnessOfTwoPixels([[maybe_unused]] __m128i from, [[maybe_unused]] uint32_t brightness)
 {
 #if (SSE_VERSION < 3)
 	NOT_REACHED();