diff --git a/PC/VC6/pythoncore.dsp b/PC/VC6/pythoncore.dsp
index 1d2415cd8b4..391510becd1 100644
--- a/PC/VC6/pythoncore.dsp
+++ b/PC/VC6/pythoncore.dsp
@@ -329,6 +329,10 @@ SOURCE=..\dl_nt.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\Python\dtoa.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\Python\dynload_win.c
 # End Source File
 # Begin Source File
diff --git a/PC/VS7.1/pythoncore.vcproj b/PC/VS7.1/pythoncore.vcproj
index 1b50c0b6ead..c24332f7bee 100644
--- a/PC/VS7.1/pythoncore.vcproj
+++ b/PC/VS7.1/pythoncore.vcproj
@@ -511,6 +511,9 @@
 		<File
 			RelativePath="..\..\PC\dl_nt.c">
 		</File>
+		<File
+			RelativePath="..\..\Python\dtoa.c">
+		</File>
 		<File
 			RelativePath="..\..\Python\dynload_win.c">
 		</File>
diff --git a/PC/VS8.0/pythoncore.vcproj b/PC/VS8.0/pythoncore.vcproj
index 6a62eee8b18..bc249bcd1e1 100644
--- a/PC/VS8.0/pythoncore.vcproj
+++ b/PC/VS8.0/pythoncore.vcproj
@@ -714,6 +714,10 @@
 				RelativePath="..\..\Include\dictobject.h"
 				>
 			</File>
+			<File
+				RelativePath="..\..\Include\dtoa.h"
+				>
+			</File>
 			<File
 				RelativePath="..\..\Include\enumobject.h"
 				>