diff --git a/makefiles/Makefile.win.mk b/makefiles/Makefile.win.mk
index 7919c739f3..e0f1e77ebe 100644
--- a/makefiles/Makefile.win.mk
+++ b/makefiles/Makefile.win.mk
@@ -119,7 +119,7 @@ ifdef WINDOWS_CPLEX_DIR
   DYNAMIC_CPLEX_LNK = $(STATIC_CPLEX_LNK)
 endif
 ifdef WINDOWS_XPRESS_DIR
-  XPRESS_INC = /I"$(WINDOWS_XPRESS_DIR)\\include" /DUSE_XPRESS /DXPRESS_PATH="$(WINDOWS_XPRESS_DIR)"
+  XPRESS_INC = /I"$(WINDOWS_XPRESS_DIR)\\include" /DUSE_XPRESS /DXPRESS_PATH=\"$(WINDOWS_XPRESS_DIR)\"
   XPRESS_SWIG = -I"$(WINDOWS_XPRESS_DIR)/include" -DUSE_XPRESS
   STATIC_XPRESS_LNK = "$(WINDOWS_XPRESS_DIR)\\lib\\xprs.lib"
   DYNAMIC_XPRESS_LNK = $(STATIC_XPRESS_LNK)
diff --git a/ortools/linear_solver/xpress_interface.cc b/ortools/linear_solver/xpress_interface.cc
index 2eea66b10a..763a327a7f 100644
--- a/ortools/linear_solver/xpress_interface.cc
+++ b/ortools/linear_solver/xpress_interface.cc
@@ -265,7 +265,7 @@ int init_xpress_env(int xpress_oem_license_key = 0) {
     LOG(WARNING)
         << "Environment variable XPRESS undefined. Trying compile path "
         << "'" << STRINGIFY(XPRESS_PATH) << "'";
-#if defined(__MSC_VER)        
+#if defined(_MSC_VER)
     xpresspath = STRINGIFY(XPRESS_PATH) "\\bin";
 #else  // _MSC_VER
     xpresspath = STRINGIFY(XPRESS_PATH) "/bin";