diff --git a/visualc/vngspice.vcproj b/visualc/vngspice.vcproj
index e0fd937ff..03828aa5e 100644
--- a/visualc/vngspice.vcproj
+++ b/visualc/vngspice.vcproj
@@ -1670,6 +1670,10 @@
 				RelativePath="..\src\frontend\dotcards.h"
 				>
 			</File>
+			<File
+				RelativePath="..\src\include\dstring.h"
+				>
+			</File>
 			<File
 				RelativePath="..\src\misc\dup2.h"
 				>
@@ -5558,6 +5562,10 @@
 				RelativePath="..\src\spicelib\analysis\dsetparm.c"
 				>
 			</File>
+			<File
+				RelativePath="..\src\misc\dstring.c"
+				>
+			</File>
 			<File
 				RelativePath="..\src\misc\dup2.c"
 				>