diff --git a/src/paveit/datamodels/enumeration.py b/src/paveit/datamodels/enumeration.py
index 9b3fbeb..1e5af26 100755
--- a/src/paveit/datamodels/enumeration.py
+++ b/src/paveit/datamodels/enumeration.py
@@ -46,6 +46,6 @@ class NormEnum(Enum):
     DINEN12592 = "DIN EN 12592"
     DINEN12593 = "DIN EN 12593"
     DINISO2592 = "DIN EN ISO 2592"
-    TLBitumen2019 = 'TL Bitumen-StB (08/2019) '
+    TLBitumen2019 = "TL Bitumen-StB (08/2019)"
     #Gestein
-    TLGestein2018 = "'TL Gestein-StB 04 (2018)'"
\ No newline at end of file
+    TLGestein2018 = "TL Gestein-StB 04 (2018)"
\ No newline at end of file