diff --git a/c b/c
index 3980e21..3621cb9 100755
--- a/c
+++ b/c
@@ -34,7 +34,7 @@ cleanup() {
 
 # Handle --help, -h, and zero args
 [[ "$1" == "--help" || "$1" == "-h" ]] && { help_msg 1; exit 0; }
-[[ "$#" -lt 1 ]] && { help_msg 2; exit 1; }
+[[ "$#" -lt 1 ]] && { help_msg 2; exit 2; }
 
 # ensure our $CC and $CXX variables are set
 [[ -z "$CC" ]]  && CC=cc
@@ -155,9 +155,14 @@ binname="$tmproot/$id.bin"
 run() {
     trap cleanup SIGINT
 
-    shift
-    (exec -a "$fname" "$binname" "$@")
-    ret=$?
+    if [ -x "$binname" ]; then
+      shift
+      (exec -a "$fname" "$binname" "$@")
+      ret=$?
+    else
+      echo
+      ret=4
+    fi
 
     trap - SIGINT
     cleanup
diff --git a/tests/test.sh b/tests/test.sh
index 4053f42..3711835 100755
--- a/tests/test.sh
+++ b/tests/test.sh
@@ -9,7 +9,7 @@ source "./test_helpers.sh"
 [ -n "$CC" ]  && "$CC"  --version
 [ -n "$CXX" ] && "$CXX" --version
 [ -n "$FC" ]  && "$FC"  --version
-c --version
+$c --version
 
 # Run tests
 source ./argument_and_link_test/test.sh