diff --git a/Makefile b/Makefile
index 6a691a2..0eef112 100755
--- a/Makefile
+++ b/Makefile
@@ -32,7 +32,7 @@ PASSPREDICTOBJECTS=$(PASSPREDICTSOURCES:.cpp=.o)
 all: $(SGP4LIB) ${TESTPROG} ${SATTRACK} ${PASSPREDICT}
 
 ${SGP4LIB}: ${OBJECTS}
-	${AR} -rcs -o $@ ${OBJECTS}
+	${AR} -rcs $@ ${OBJECTS}
 
 ${TESTPROG}: ${SGP4LIB} ${TESTPROGOBJECTS}
 	$(CC) ${TESTPROGOBJECTS} $(LDFLAGS) -L. -lsgp4 -o $@