diff --git a/test_problems/cathermo/HMW_graph_CpvT/Cp_standalone.cpp b/test_problems/cathermo/HMW_graph_CpvT/Cp_standalone.cpp
index 2b11c0a61..e21ef9390 100644
--- a/test_problems/cathermo/HMW_graph_CpvT/Cp_standalone.cpp
+++ b/test_problems/cathermo/HMW_graph_CpvT/Cp_standalone.cpp
@@ -165,8 +165,7 @@ double calc(double temp, double Iionic) {
 
   double molecWeight = 18.01528;
 
-  double RT = GasConst * temp * 1.0E-3;
-
+  //double RT = GasConst * temp * 1.0E-3;
 
   double xo = 1.0 / (molecWeight/1000. * 2 * m + 1.0);
   printf(" no = %g\n", xo);
@@ -174,7 +173,7 @@ double calc(double temp, double Iionic) {
   return phiJ;
 }
 
-main() {
+int main() {
 
   printf("Standalone test of the apparent relative molal enthalpy, phiL:\n");
   printf(" (Check against simple formula in Silvester&Pitzer, J. Phys. Chem. 81, 1822 (1977)\n");
@@ -188,5 +187,5 @@ main() {
   printf("Ionic Strength = %g\n", Iionic);
 
   res = calc(273.15 + 200., Iionic);
-
+  return 0;
 }
diff --git a/test_problems/cathermo/HMW_graph_CpvT/Makefile.in b/test_problems/cathermo/HMW_graph_CpvT/Makefile.in
index 77d5eb64e..ceb8efe3a 100644
--- a/test_problems/cathermo/HMW_graph_CpvT/Makefile.in
+++ b/test_problems/cathermo/HMW_graph_CpvT/Makefile.in
@@ -108,7 +108,7 @@ endif
 	@ ./runtest
 
 clean:
-	$(RM) $(OBJS) $(PROGRAM) $(DEPENDS) .depends
+	$(RM) $(OBJS) $(PROGRAM) $(DEPENDS) .depends *.o
 	../../../bin/rm_cvsignore
 	(if test -d SunWS_cache ; then \
            $(RM) -rf SunWS_cache ; \