diff --git a/src/main/java/com/esaulpaugh/headlong/abi/ABIType.java b/src/main/java/com/esaulpaugh/headlong/abi/ABIType.java
index 7af00a3f..88392a82 100644
--- a/src/main/java/com/esaulpaugh/headlong/abi/ABIType.java
+++ b/src/main/java/com/esaulpaugh/headlong/abi/ABIType.java
@@ -23,7 +23,6 @@
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.function.IntFunction;
-import java.util.regex.Pattern;
 
 import static com.esaulpaugh.headlong.abi.UnitType.UNIT_LENGTH_BYTES;
 
@@ -161,7 +160,7 @@ final void validateClass(J value) {
             }
             throw mismatchErr("class",
                     value.getClass().getName(), clazz.getName(),
-                    friendlyClassName(clazz, -1), friendlyClassName(value.getClass(), -1));
+                    clazz.getSimpleName(), value.getClass().getSimpleName());
         }
     }
 
@@ -362,11 +361,4 @@ static void appendPadded(final int leftPadding, String unpadded, StringBuilder s
             sb.append(' ');
         }
     }
-
-    static String friendlyClassName(Class<?> clazz, int arrayLen) {
-        final String simple = clazz.getSimpleName();
-        return arrayLen > 0 && simple.indexOf('[') > 0
-                ? simple.replaceFirst(Pattern.quote("[]"), "[" + arrayLen + "]")
-                : simple;
-    }
 }
diff --git a/src/main/java/com/esaulpaugh/headlong/abi/ArrayType.java b/src/main/java/com/esaulpaugh/headlong/abi/ArrayType.java
index 564b29f1..a1c6f27c 100644
--- a/src/main/java/com/esaulpaugh/headlong/abi/ArrayType.java
+++ b/src/main/java/com/esaulpaugh/headlong/abi/ArrayType.java
@@ -21,6 +21,7 @@
 import java.lang.reflect.Array;
 import java.nio.ByteBuffer;
 import java.util.function.IntUnaryOperator;
+import java.util.regex.Pattern;
 
 import static com.esaulpaugh.headlong.abi.TupleType.countBytes;
 import static com.esaulpaugh.headlong.abi.TupleType.totalLen;
@@ -226,12 +227,18 @@ private int measureByteLengthPacked(E[] arr) { // don't count offsets
     private int checkLength(final int valueLen, Object value) {
         if (length != DYNAMIC_LENGTH && length != valueLen) {
             throw mismatchErr("array length",
-                    friendlyClassName(value.getClass(), valueLen), friendlyClassName(clazz, length),
+                    simpleName(value.getClass(), valueLen), simpleName(clazz, length),
                     "length " + length, "" + valueLen);
         }
         return valueLen;
     }
 
+    private static final Pattern BRACKETS = Pattern.compile(Pattern.quote("[]"));
+
+    private static String simpleName(Class<?> clazz, int arrayLen) {
+        return BRACKETS.matcher(clazz.getSimpleName()).replaceFirst("[" + arrayLen + "]");
+    }
+
     @SuppressWarnings("unchecked")
     @Override
     void encodeTail(A value, ByteBuffer dest) {