diff --git a/Cantera/src/equil/vcs_linmaxc.cpp b/Cantera/src/equil/vcs_linmaxc.cpp
index 904f710c9..1512b317d 100644
--- a/Cantera/src/equil/vcs_linmaxc.cpp
+++ b/Cantera/src/equil/vcs_linmaxc.cpp
@@ -20,6 +20,7 @@
 //extern int vcs_debug_print_lvl;
 #endif
 
+#include "vcs_internal.h"
 
 extern "C" void dbocls_(double *W, int *MDW, int *MCON, int *MROWS,
 			int *NCOLS,
@@ -31,6 +32,7 @@ extern "C" void dbocls_(double *W, int *MDW, int *MCON, int *MROWS,
 * This whole program is a wrapper for the slatec routine, DBOCLS()
 * DBOCLS solves a bounded and constrained least squares problem.
 ******************************************************************************/
+namespace VCSnonideal {
 
 int linprogmax(double *XMOLES, double *CC, double *AX, double *BB, 
 	       int NE, int M, int NE0)
@@ -144,3 +146,5 @@ int linprogmax(double *XMOLES, double *CC, double *AX, double *BB,
    
    return 0;
 }
+
+}