diff --git a/tcl.spec b/tcl.spec
index d7c5d7d..2e33571 100644
--- a/tcl.spec
+++ b/tcl.spec
@@ -97,8 +97,8 @@ cat > known-failures <<EOF
 httpold-4.12
 mathop-25.14
 EOF
-#eval $MAKE test 2>&1 | tee testresults
-#grep FAILED testresults | grep -Fqvf known-failures && exit 1
+eval $MAKE test 2>&1 | tee testresults
+grep FAILED testresults | grep -Fqvf known-failures && exit 1
 # If we don't do profile based optimisation, we are done at this point.
 test -z "$PFLAGS" && exit 0
 # Rebuild and use the profiling results