diff --git a/common.mk b/common.mk
index 6578529..702d59b 100644
--- a/common.mk
+++ b/common.mk
@@ -14,7 +14,7 @@ benchmark:
 chibi: main.scm
 	chibi-scheme main.scm ${INPUTS}
 chicken: main.scm
-	/opt/chicken/bin/csi -script main.scm ${INPUTS}
+	PATH=/opt/chicken/bin:$$PATH csi -script main.scm ${INPUTS}
 gauche: main.scm
 	gosh main.scm ${INPUTS}
 guile: main.scm