diff --git a/projects/jackson-datatypes-collections/EclipseCollectionsDeserializerFuzzer.java b/projects/jackson-datatypes-collections/EclipseCollectionsDeserializerFuzzer.java
index 0ae2e46b2..b4da4193a 100644
--- a/projects/jackson-datatypes-collections/EclipseCollectionsDeserializerFuzzer.java
+++ b/projects/jackson-datatypes-collections/EclipseCollectionsDeserializerFuzzer.java
@@ -38,7 +38,7 @@ public class EclipseCollectionsDeserializerFuzzer {
       String value = data.consumeRemainingAsString();
       mapper.readValue(value, type);
       mapper.readTree(value);
-    } catch (IOException e) {
+    } catch (IOException | IllegalArgumentException e) {
       // Known exception
     }
   }
diff --git a/projects/jackson-datatypes-collections/GuavaDeserializerFuzzer.java b/projects/jackson-datatypes-collections/GuavaDeserializerFuzzer.java
index dd3afeaed..a96901254 100644
--- a/projects/jackson-datatypes-collections/GuavaDeserializerFuzzer.java
+++ b/projects/jackson-datatypes-collections/GuavaDeserializerFuzzer.java
@@ -65,7 +65,7 @@ public class GuavaDeserializerFuzzer {
       TypeReference type = data.pickValue(choice);
       String value = data.consumeRemainingAsString();
       mapper.readValue(value, type);
-    } catch (IOException e) {
+    } catch (IOException | IllegalArgumentException e) {
       // Known exception
     }
   }