diff --git a/Makefile b/Makefile
index 4665605..337b33e 100644
--- a/Makefile
+++ b/Makefile
@@ -199,19 +199,19 @@ dist: clean
 sbase-box: $(LIB) $(SRC)
 	mkdir -p build
 	cp $(HDR) build
-	for f in $(SRC); do sed "s/^main(/`basename $$f .c`_&/" < $$f > build/$$f; done
+	for f in $(SRC); do sed "s/^main(/$${f%.c}_&/" < $$f > build/$$f; done
 	echo '#include <libgen.h>'  > build/$@.c
 	echo '#include <stdio.h>'  >> build/$@.c
 	echo '#include <stdlib.h>' >> build/$@.c
 	echo '#include <string.h>' >> build/$@.c
 	echo '#include "util.h"'   >> build/$@.c
-	for f in $(SRC); do echo "int `basename $$f .c`_main(int, char **);" >> build/$@.c; done
+	for f in $(SRC); do echo "int $${f%.c}_main(int, char **);" >> build/$@.c; done
 	echo 'int main(int argc, char *argv[]) { char *s = basename(argv[0]); if(!strcmp(s,"sbase-box")) { argc--; argv++; s = basename(argv[0]); } if(0) ;' >> build/$@.c
 	echo "else if (!strcmp(s, \"[\")) return test_main(argc, argv);" >> build/$@.c
-	for f in $(SRC); do echo "else if(!strcmp(s, \"`basename $$f .c`\")) return `basename $$f .c`_main(argc, argv);" >> build/$@.c; done
+	for f in $(SRC); do echo "else if(!strcmp(s, \"$${f%.c}\")) return $${f%.c}_main(argc, argv);" >> build/$@.c; done
 	echo 'else {' >> build/$@.c
 	echo "printf(\"[\"); putchar(' ');" >> build/$@.c
-	for f in $(SRC); do echo "printf(\"`basename $$f .c`\"); putchar(' ');" >> build/$@.c; done
+	for f in $(SRC); do echo "printf(\"$${f%.c}\"); putchar(' ');" >> build/$@.c; done
 	echo "putchar(0xa); }; return 0; }" >> build/$@.c
 	$(LD) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ build/*.c $(LIB)
 	rm -r build