diff --git a/src/proc.h b/src/proc.h
index 6ac42c753..1b6ed6e60 100644
--- a/src/proc.h
+++ b/src/proc.h
@@ -73,7 +73,12 @@ class proc_status_t {
     static constexpr int w_exitcode(int ret, int sig) {
 #ifdef W_EXITCODE
         return W_EXITCODE(ret, sig);
+#elif WEXITSTATUS(0x007f) == 0x7f
+        // It's encoded signal and then status
+        // The return status is in the lower byte.
+        return ((sig) << 8 | (ret));
 #else
+        // The status is encoded in the upper byte.
         return ((ret) << 8 | (sig));
 #endif
     }