diff --git a/BPTCEncoder/src/BC7Compressor.cpp b/BPTCEncoder/src/BC7Compressor.cpp
index 9219118..1332cc4 100755
--- a/BPTCEncoder/src/BC7Compressor.cpp
+++ b/BPTCEncoder/src/BC7Compressor.cpp
@@ -1016,7 +1016,7 @@ double BC7CompressionMode::CompressCluster(
     a2 = std::min(255.0f, std::max(0.0f, a2));
 
     // Quantize
-    const int8 maskSeed = 0x80;
+    const int8 maskSeed = -0x7F;
     const uint8 a1b = ::QuantizeChannel(
       uint8(a1), (maskSeed >> (GetAlphaChannelPrecision() - 1)));
     const uint8 a2b = ::QuantizeChannel(
diff --git a/IO/third_party/tga/targa.c b/IO/third_party/tga/targa.c
index a4c66c9..04f0a7c 100755
--- a/IO/third_party/tga/targa.c
+++ b/IO/third_party/tga/targa.c
@@ -33,6 +33,11 @@
 
 // preprocessor directives
 
+#ifdef _MSC_VER
+#  define WIN32_LEAN_AND_MEAN
+#  define _CRT_SECURE_NO_WARNINGS
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>