diff --git a/src/fr/inrialpes/exmo/ontowrap/owlapi10/OWLAPIOntologyFactory.java b/src/fr/inrialpes/exmo/ontowrap/owlapi10/OWLAPIOntologyFactory.java
index 754c29a38d7a09fd9cdaf7d7a024133d711b998a..7cabf2caaed87f438b84a0d6bedde886f0e3967f 100644
--- a/src/fr/inrialpes/exmo/ontowrap/owlapi10/OWLAPIOntologyFactory.java
+++ b/src/fr/inrialpes/exmo/ontowrap/owlapi10/OWLAPIOntologyFactory.java
@@ -55,7 +55,7 @@ public class OWLAPIOntologyFactory extends OntologyFactory {
 	} catch (URISyntaxException ex) { ex.printStackTrace(); } // should not happen
     };
 
-    public void clearCache() {
+    public void clearCache() throws OntowrapException {
 	cache.clear();
     }