Negate errno in return, positive values reservedHEADmaster

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test.c b/src/test.c
index 0f2bc55..0c8d3d8 100644
--- a/src/test.c
+++ b/src/test.c
@@ -5,7 +5,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#define LIBBITVEC_ERR(rc) errx(1, "libbitvec: %s", strerror(rc))
+#define LIBBITVEC_ERR(rc) errx(1, "libbitvec: %s", rc < 0 ? strerror(-rc) : "???")
 
 int
 main(int argc, const char **argv)