diff --git a/src/libFLAC/fixed.c b/src/libFLAC/fixed.c
index 8c96cc0..16b542d 100644
--- a/src/libFLAC/fixed.c
+++ b/src/libFLAC/fixed.c
@@ -42,7 +42,6 @@
 #include "FLAC/assert.h"
 
 #ifndef M_LN2
-/* math.h in VC++ doesn't seem to have this (how Microsoft is that?) */
 #define M_LN2 0.69314718055994530942
 #endif
 
diff --git a/src/libFLAC/libFLAC_dynamic.vcproj b/src/libFLAC/libFLAC_dynamic.vcproj
index ba689ab..0abb717 100644
--- a/src/libFLAC/libFLAC_dynamic.vcproj
+++ b/src/libFLAC/libFLAC_dynamic.vcproj
@@ -38,6 +38,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+				AdditionalOptions="/D &quot;_USE_MATH_DEFINES&quot;"
 				Optimization="0"
 				AdditionalIncludeDirectories=".\include;..\..\include"
 				PreprocessorDefinitions="WIN32;_DEBUG;_WINDOWS;_USRDLL;FLAC_API_EXPORTS;FLAC__HAS_OGG;FLAC__CPU_IA32;FLAC__HAS_NASM;FLAC__USE_3DNOW;FLAC__ALIGN_MALLOC_DATA;VERSION=\&quot;1.3.0\&quot;;DEBUG;FLAC__OVERFLOW_DETECT"
@@ -114,6 +115,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+				AdditionalOptions="/D &quot;_USE_MATH_DEFINES&quot;"
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				OmitFramePointers="true"
diff --git a/src/libFLAC/libFLAC_static.vcproj b/src/libFLAC/libFLAC_static.vcproj
index 1ace70c..de48c50 100644
--- a/src/libFLAC/libFLAC_static.vcproj
+++ b/src/libFLAC/libFLAC_static.vcproj
@@ -38,6 +38,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+				AdditionalOptions="/D &quot;_USE_MATH_DEFINES&quot;"
 				Optimization="0"
 				AdditionalIncludeDirectories=".\include;..\..\include"
 				PreprocessorDefinitions="WIN32;_DEBUG;_LIB;FLAC__HAS_OGG;FLAC__CPU_IA32;FLAC__HAS_NASM;FLAC__USE_3DNOW;FLAC__ALIGN_MALLOC_DATA;VERSION=\&quot;1.3.0\&quot;;FLAC__NO_DLL;DEBUG;FLAC__OVERFLOW_DETECT"
@@ -103,6 +104,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+				AdditionalOptions="/D &quot;_USE_MATH_DEFINES&quot;"
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				OmitFramePointers="true"
diff --git a/src/libFLAC/lpc.c b/src/libFLAC/lpc.c
index 3dee02e..476368a 100644
--- a/src/libFLAC/lpc.c
+++ b/src/libFLAC/lpc.c
@@ -52,7 +52,6 @@
 #ifndef FLAC__INTEGER_ONLY_LIBRARY
 
 #ifndef M_LN2
-/* math.h in VC++ doesn't seem to have this (how Microsoft is that?) */
 #define M_LN2 0.69314718055994530942
 #endif