diff --git a/sentry_sdk/tracing_utils.py b/sentry_sdk/tracing_utils.py
index 587133ad67..5c3f530e2e 100644
--- a/sentry_sdk/tracing_utils.py
+++ b/sentry_sdk/tracing_utils.py
@@ -367,9 +367,9 @@ def extract_sentrytrace_data(header):
     trace_id, parent_span_id, sampled_str = match.groups()
     parent_sampled = None
 
-    if trace_id:
+    if trace_id and len(trace_id) != 32:
         trace_id = "{:032x}".format(int(trace_id, 16))
-    if parent_span_id:
+    if parent_span_id and len(parent_span_id) != 16:
         parent_span_id = "{:016x}".format(int(parent_span_id, 16))
     if sampled_str:
         parent_sampled = sampled_str != "0"