diff --git a/youtube_dl/extractor/prosiebensat1.py b/youtube_dl/extractor/prosiebensat1.py
index 7c9743fe8..7e680a728 100644
--- a/youtube_dl/extractor/prosiebensat1.py
+++ b/youtube_dl/extractor/prosiebensat1.py
@@ -344,7 +344,7 @@ class ProSiebenSat1IE(ProSiebenSat1BaseIE):
         r'clip[iI]d=(\d+)',
         r'clip[iI]d\s*=\s*["\'](\d+)',
         r"'itemImageUrl'\s*:\s*'/dynamic/thumbnails/full/\d+/(\d+)",
-        r'proMamsId":"(\d+)',
+        r'proMamsId"\s*:\s*"(\d+)',
     ]
     _TITLE_REGEXES = [
         r'<h2 class="subtitle" itemprop="name">\s*(.+?)</h2>',