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-rw-r--r--stdlib/Makefile4
1 files changed, 3 insertions, 1 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index 9eededd095..de6800ae8d 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -130,7 +130,9 @@ endif
 test-canon-ARGS = --test-dir=${common-objpfx}stdlib
 
 # Run a test on the header files we use.
-tests: $(objpfx)isomac
+tests: $(objpfx)isomac.out
+
+$(objpfx)isomac.out: $(objpfx)isomac
 	$(dir $<)$(notdir $<) '$(CC)' '-I../include -I.. $(+sysdep-includes)' > $<.out
 
 $(objpfx)isomac: isomac.c