diff --git a/compiler/core/src/zserio/tools/ExtensionManager.java b/compiler/core/src/zserio/tools/ExtensionManager.java
index 384a1d25b..52b37ede6 100644
--- a/compiler/core/src/zserio/tools/ExtensionManager.java
+++ b/compiler/core/src/zserio/tools/ExtensionManager.java
@@ -151,7 +151,7 @@ private File getWorkingDirectory()
             {
                 decodedExecFile = new File(new URI(decodedExecUrlPath));
             }
-            catch (URISyntaxException excpt)
+            catch (URISyntaxException | IllegalArgumentException excpt)
             {
                 decodedExecFile = new File(decodedExecUrlPath);
             }