diff --git a/.github/workflows/version-check.py b/.github/workflows/version-check.py
--- a/.github/workflows/version-check.py
+++ b/.github/workflows/version-check.py
@@ -9,7 +9,7 @@
 repo = Repo()
 
 tag = repo.git.describe(tags = True, abbrev=0)
-m = re.match('llvmorg-([0-9]+)\.([0-9]+)\.([0-9]+)', tag)
+m = re.match('llvmorg-([0-9]+)\.([0-9]+)\.([0-9]+)$', tag)
 
 if m:
     expected_major = m.group(1)
@@ -19,8 +19,11 @@
     # If the previous tag is llvmorg-X-init, then we should be at version X.0.0.
     m = re.match('llvmorg-([0-9]+)-init', tag)
     if not m:
-        print("error: Tag is not valid: ", tag)
-        sys.exit(1)
+        # Check if this is an rc tag.
+        m = re.match('llvmorg-([0-9]+)\.0\.0-rc[0-9]+', tag)
+        if not m:
+            print("error: Tag is not valid: ", tag)
+            sys.exit(1)
     expected_major = m.group(1)
     expected_minor = 0
     expected_patch = 0