diff --git a/unit/GNUmakefile b/unit/GNUmakefile
index ff38528e..608e3b9c 100644
--- a/unit/GNUmakefile
+++ b/unit/GNUmakefile
@@ -37,6 +37,7 @@ VPATH               = .:../src:../src/phreeqcpp
 
 # test objs
 TOBJS =	\
+	FileTest.o \
 	TestCVar.o \
 	TestIPhreeqc.o \
 	TestIPhreeqcLib.o \