diff --git a/msvc/vs17/mpir.sln b/msvc/vs17/mpir.sln
index cc857bd5..7cf3dbbc 100644
--- a/msvc/vs17/mpir.sln
+++ b/msvc/vs17/mpir.sln
@@ -69,6 +69,6 @@ Global
 		HideSolutionNode = FALSE
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {F1571729-8239-405F-8B06-0F3FE5F50850}
+		SolutionGuid = {21CF1362-6E60-4CF7-ADF1-940C64DCD166}
 	EndGlobalSection
 EndGlobal