diff --git a/test_problems/ChemEquil_ionizedGas/Makefile.in b/test_problems/ChemEquil_ionizedGas/Makefile.in
index 38ed51872..d54a6e340 100644
--- a/test_problems/ChemEquil_ionizedGas/Makefile.in
+++ b/test_problems/ChemEquil_ionizedGas/Makefile.in
@@ -33,6 +33,10 @@ os_is_win = @OS_IS_WIN@
 # Fortran libraries
 FORT_LIBS = @FLIBS@
 
+# Executables extension
+extension = @EXE_EXT@
+extension2 = @EXEEXT@
+
 # the C++ compiler
 CXX = @CXX@
 
diff --git a/test_problems/ChemEquil_ionizedGas/runtest b/test_problems/ChemEquil_ionizedGas/runtest
index fbc3d54b4..fd3491471 100755
--- a/test_problems/ChemEquil_ionizedGas/runtest
+++ b/test_problems/ChemEquil_ionizedGas/runtest
@@ -21,7 +21,7 @@ fi
 
 diff -w output.txt output_blessed.txt > diff_out.txt
 retnStat_txt=$?
-csvdiff -a 1.0E-50 table.csv table_blessed.csv > diff_csv.txt
+${CANTERA_BIN}/csvdiff -a 1.0E-50 table.csv table_blessed.csv > diff_csv.txt
 retnStat_csv=$?
 
 eCode=1