diff --git a/src/test/java/net/ripe/rpki/commons/crypto/cms/roa/RoaPrefixTest.java b/src/test/java/net/ripe/rpki/commons/crypto/cms/roa/RoaPrefixTest.java
index 300133c2..efffdbd9 100644
--- a/src/test/java/net/ripe/rpki/commons/crypto/cms/roa/RoaPrefixTest.java
+++ b/src/test/java/net/ripe/rpki/commons/crypto/cms/roa/RoaPrefixTest.java
@@ -55,9 +55,13 @@ public void testCalculateEffectiveLength() {
         var p2 = new RoaPrefix(IpRange.parse("11.0.0.0/8"));
         // An equal copy of p2
         var p2_8 = new RoaPrefix(IpRange.parse("11.0.0.0/8"), 8);
+        var p2_32 = new RoaPrefix(IpRange.parse("11.0.0.0/8"), 32);
 
+        // implict maximum length is the prefix length
         assertThat(p2.getEffectiveMaximumLength()).isEqualTo(8);
         assertThat(p2_8.getEffectiveMaximumLength()).isEqualTo(8);
+        // and effective maximum length reflects the actual maximum length
+        assertThat(p2_8.getEffectiveMaximumLength()).isEqualTo(32);
     }
 
     @Test