diff --git a/pkgs/build-support/setup-hooks/audit-tmpdir.sh b/pkgs/build-support/setup-hooks/audit-tmpdir.sh
index 0f515842ebce..43ea0d6caecd 100644
--- a/pkgs/build-support/setup-hooks/audit-tmpdir.sh
+++ b/pkgs/build-support/setup-hooks/audit-tmpdir.sh
@@ -13,23 +13,23 @@ auditTmpdir() {
     local dir="$1"
     [ -e "$dir" ] || return 0
 
-    header "checking for references to $TMPDIR in $dir..."
+    header "checking for references to $TMPDIR/ in $dir..."
 
     local i
     while IFS= read -r -d $'\0' i; do
         if [[ "$i" =~ .build-id ]]; then continue; fi
 
         if isELF "$i"; then
-            if patchelf --print-rpath "$i" | grep -q -F "$TMPDIR"; then
-                echo "RPATH of binary $i contains a forbidden reference to $TMPDIR"
+            if patchelf --print-rpath "$i" | grep -q -F "$TMPDIR/"; then
+                echo "RPATH of binary $i contains a forbidden reference to $TMPDIR/"
                 exit 1
             fi
         fi
 
         if  isScript "$i"; then
             if [ -e "$(dirname "$i")/.$(basename "$i")-wrapped" ]; then
-                if grep -q -F "$TMPDIR" "$i"; then
-                    echo "wrapper script $i contains a forbidden reference to $TMPDIR"
+                if grep -q -F "$TMPDIR/" "$i"; then
+                    echo "wrapper script $i contains a forbidden reference to $TMPDIR/"
                     exit 1
                 fi
             fi