diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 396c4876241..5d9beff196c 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -229,16 +229,16 @@ sub GenerateFiles
 		HAVE_CRYPTO_LOCK           => undef,
 		HAVE_DECL_FDATASYNC        => 0,
 		HAVE_DECL_F_FULLFSYNC      => 0,
-		HAVE_DECL_LLVMCREATEGDBREGISTRATIONLISTENER => undef,
-		HAVE_DECL_LLVMCREATEPERFJITEVENTLISTENER    => undef,
+		HAVE_DECL_LLVMCREATEGDBREGISTRATIONLISTENER => 0,
+		HAVE_DECL_LLVMCREATEPERFJITEVENTLISTENER    => 0,
 		HAVE_DECL_LLVMGETHOSTCPUNAME                => 0,
 		HAVE_DECL_LLVMGETHOSTCPUFEATURES            => 0,
 		HAVE_DECL_LLVMORCGETSYMBOLADDRESSIN         => 0,
-		HAVE_DECL_POSIX_FADVISE                     => undef,
+		HAVE_DECL_POSIX_FADVISE                     => 0,
 		HAVE_DECL_RTLD_GLOBAL                       => 0,
 		HAVE_DECL_RTLD_NOW                          => 0,
-		HAVE_DECL_STRLCAT                           => undef,
-		HAVE_DECL_STRLCPY                           => undef,
+		HAVE_DECL_STRLCAT                           => 0,
+		HAVE_DECL_STRLCPY                           => 0,
 		HAVE_DECL_STRNLEN                           => 1,
 		HAVE_DECL_STRTOLL                           => 1,
 		HAVE_DECL_STRTOULL                          => 1,