diff --git a/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/CleaningFunctions.java b/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/CleaningFunctions.java
index 183214c..c56eed4 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/CleaningFunctions.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/CleaningFunctions.java
@@ -12,7 +12,7 @@ import eu.dnetlib.dhp.schema.oaf.StructuredProperty;
 
 public class CleaningFunctions {
 
-	public static final String DOI_PREFIX_REGEX = "(^10\\.|\\/10.)";
+	public static final String DOI_PREFIX_REGEX = "(^10\\.|\\/10\\.)";
 	public static final String DOI_PREFIX = "10.";
 
 	public static final Set<String> PID_BLACKLIST = new HashSet<>();