diff --git a/1990/stig/Makefile b/1990/stig/Makefile
index 38c152433..6c0169965 100644
--- a/1990/stig/Makefile
+++ b/1990/stig/Makefile
@@ -127,7 +127,7 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "source stig.sh ; source stig.c" | ${ZSH}
+	@echo "source stig.sh ; source stig.c" | ${SH}
 
 # alternative executable
 #