diff --git a/variables.msvc b/variables.msvc
index 7e7cda4cb28894934432628319a93ff26e0d673e..f0e95a81876ff31ea297db924ef3d8040b604ae9 100644
--- a/variables.msvc
+++ b/variables.msvc
@@ -10,7 +10,7 @@ HOSTNAME=localhost
 
 # The names of the C and C++ compilers
 CC=cl
-CXX=cl /EHsc /nologo /GR 
+CXX=cl /EHsc /nologo /GR /MTd
 # Add /MLd for single-thread debug mode
 #     /MTd for multi-thread debug mode