diff --git a/wmdr/unit/nmol.kg-1.ttl b/wmdr/unit/nmol.kg-1.ttl
index b4f6fb3c..41407660 100644
--- a/wmdr/unit/nmol.kg-1.ttl
+++ b/wmdr/unit/nmol.kg-1.ttl
@@ -5,4 +5,4 @@
 <nmol.kg-1> a skos:Concept ;
 	rdfs:label "nanomole per kilogram" ;
 	skos:notation "nmol.kg-1" ;
-	dct:description "'SI derived unit of amount per unit mass; SI base unit equivalent: 1E-9 mol.kg-1'"@en	.
+	dct:description "SI derived unit of amount per unit mass; SI base unit equivalent: 1E-9 mol.kg-1"@en	.
diff --git a/wmdr/unit/pmol.kg-1.ttl b/wmdr/unit/pmol.kg-1.ttl
index 0e7ec3e4..4d7cb708 100644
--- a/wmdr/unit/pmol.kg-1.ttl
+++ b/wmdr/unit/pmol.kg-1.ttl
@@ -5,4 +5,4 @@
 <pmol.kg-1> a skos:Concept ;
 	rdfs:label "picomole per kilogram" ;
 	skos:notation "pmol.kg-1" ;
-	dct:description "'SI derived unit of amount per unit mass; SI base unit equivalent: 1E-12 mol.kg-1'"@en	.
+	dct:description "SI derived unit of amount per unit mass; SI base unit equivalent: 1E-12 mol.kg-1"@en	.