diff --git a/thirdparty/libwebp/sharpyuv/sharpyuv_gamma.c b/thirdparty/libwebp/sharpyuv/sharpyuv_gamma.c
index 09028428ac..6f1a88bf1a 100644
--- a/thirdparty/libwebp/sharpyuv/sharpyuv_gamma.c
+++ b/thirdparty/libwebp/sharpyuv/sharpyuv_gamma.c
@@ -26,7 +26,11 @@ static uint32_t kGammaToLinearTabS[GAMMA_TO_LINEAR_TAB_SIZE + 2];
 #define LINEAR_TO_GAMMA_TAB_SIZE (1 << LINEAR_TO_GAMMA_TAB_BITS)
 static uint32_t kLinearToGammaTabS[LINEAR_TO_GAMMA_TAB_SIZE + 2];
 
+#if defined(_MSC_VER)
+static const double kGammaF = 2.222222222222222;
+#else
 static const double kGammaF = 1. / 0.45;
+#endif
 #define GAMMA_TO_LINEAR_BITS 16
 
 static volatile int kGammaTablesSOk = 0;