diff --git a/test/TableGen/ValidIdentifiers.td b/test/TableGen/ValidIdentifiers.td
index 899ae0e3868..039d887cf3e 100644
--- a/test/TableGen/ValidIdentifiers.td
+++ b/test/TableGen/ValidIdentifiers.td
@@ -1,5 +1,5 @@
 // Ensure that anonymous names are valid identifiers via the ctags index
-// RUN: llvm-tblgen -gen-ctags %s | grep -v '^!' | not grep -viE '^[a-z_][a-z0-9_]*\t'
+// RUN: llvm-tblgen -gen-ctags %s | grep -v '^!' | not grep -viE '^[a-z_][a-z0-9_]*\s'
 // Test validation
 // RUN: llvm-tblgen -gen-ctags %s | grep '^anonymous' > /dev/null
 // XFAIL: vg_leak