diff --git a/PC/VC6/pythoncore.dsp b/PC/VC6/pythoncore.dsp
index 9ee1ebace38..3d80857e66f 100644
--- a/PC/VC6/pythoncore.dsp
+++ b/PC/VC6/pythoncore.dsp
@@ -583,6 +583,10 @@ SOURCE=..\..\Python\pyfpe.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\Python\pymath.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\Python\pystate.c
 # End Source File
 # Begin Source File
diff --git a/PC/VS7.1/pythoncore.vcproj b/PC/VS7.1/pythoncore.vcproj
index 6497d28e925..4d7943bfccd 100644
--- a/PC/VS7.1/pythoncore.vcproj
+++ b/PC/VS7.1/pythoncore.vcproj
@@ -715,6 +715,9 @@
 		<File
 			RelativePath="..\..\Python\pyfpe.c">
 		</File>
+		<File
+			RelativePath="..\..\Python\pymath.c">
+		</File>
 		<File
 			RelativePath="..\..\Python\pystate.c">
 		</File>
diff --git a/PC/VS8.0/pythoncore.vcproj b/PC/VS8.0/pythoncore.vcproj
index af92d983b43..624cf4de4a7 100644
--- a/PC/VS8.0/pythoncore.vcproj
+++ b/PC/VS8.0/pythoncore.vcproj
@@ -1738,6 +1738,10 @@
 				RelativePath="..\..\Python\pyfpe.c"
 				>
 			</File>
+			<File
+				RelativePath="..\..\Python\pymath.c"
+				>
+			</File>
 			<File
 				RelativePath="..\..\Python\pystate.c"
 				>
diff --git a/PCbuild/pythoncore.vcproj b/PCbuild/pythoncore.vcproj
index 11b8345becd..d8c1cdfb9b8 100644
--- a/PCbuild/pythoncore.vcproj
+++ b/PCbuild/pythoncore.vcproj
@@ -655,11 +655,11 @@
 				>
 			</File>
 			<File
-				RelativePath="..\Include\bytesobject.h"
+				RelativePath="..\Include\bytes_methods.h"
 				>
 			</File>
 			<File
-				RelativePath="..\Include\bytes_methods.h"
+				RelativePath="..\Include\bytesobject.h"
 				>
 			</File>
 			<File
@@ -870,6 +870,10 @@
 				RelativePath="..\Include\pymactoolbox.h"
 				>
 			</File>
+			<File
+				RelativePath="..\Include\pymath.h"
+				>
+			</File>
 			<File
 				RelativePath="..\Include\pymem.h"
 				>
@@ -1355,11 +1359,11 @@
 				>
 			</File>
 			<File
-				RelativePath="..\Objects\bytesobject.c"
+				RelativePath="..\Objects\bytes_methods.c"
 				>
 			</File>
 			<File
-				RelativePath="..\Objects\bytes_methods.c"
+				RelativePath="..\Objects\bytesobject.c"
 				>
 			</File>
 			<File
@@ -1738,6 +1742,10 @@
 				RelativePath="..\Python\pyfpe.c"
 				>
 			</File>
+			<File
+				RelativePath="..\Python\pymath.c"
+				>
+			</File>
 			<File
 				RelativePath="..\Python\pystate.c"
 				>