diff --git a/gcc/java/ChangeLog b/gcc/java/ChangeLog
index d7b9c977604bfd40b3ed23f45236f31ddd7edc16..22b1387cf8ecbcdde2ff4de835ad0fe272462f6f 100644
--- a/gcc/java/ChangeLog
+++ b/gcc/java/ChangeLog
@@ -1,3 +1,7 @@
+2005-12-05  Tom Tromey  <tromey@redhat.com>
+
+	* parse.y (patch_new_array_init): Don't set length on array.
+
 2005-12-02  Richard Guenther  <rguenther@suse.de>
 
 	* java-gimplify.c (java_gimplify_labeled_block_expr): Use
diff --git a/gcc/java/parse.y b/gcc/java/parse.y
index 555541c4bd4e6d52717c6c17c2bf2f17fff1a404..0a1d8e27f13fc3622266627e43fcfa718b3004e2 100644
--- a/gcc/java/parse.y
+++ b/gcc/java/parse.y
@@ -14857,8 +14857,12 @@ patch_new_array_init (tree type, tree node)
 
   /* Create a new type. We can't reuse the one we have here by
      patching its dimension because it originally is of dimension -1
-     hence reused by gcc. This would prevent triangular arrays. */
-  type = build_java_array_type (element_type, length);
+     hence reused by gcc. This would prevent triangular arrays.
+     Note that we don't pass the length here.  If we do that then the
+     length will end up in the signature of this type, and hence in
+     the signature of the anonymous constructor -- but this is not a
+     valid java signature.  */
+  type = build_java_array_type (element_type, -1);
   TREE_TYPE (init) = TREE_TYPE (TREE_CHAIN (TREE_CHAIN (TYPE_FIELDS (type))));
   TREE_TYPE (node) = promote_type (type);
   TREE_CONSTANT (init) = all_constant;
diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index 24eed17c47e233f23f4676c9c3b4f096bb66e76f..c920ffe595d8204dfd609819968d0eb2af9b13cd 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,7 @@
+2005-12-05  Tom Tromey  <tromey@redhat.com>
+
+	* testsuite/libjava.compile/rh174912.java: New file.
+
 2005-12-01  Geoffrey Keating  <geoffk@apple.com>
 
 	* testsuite/lib/libjava.exp (test_libjava_from_javac): Support
diff --git a/libjava/testsuite/libjava.compile/rh174912.java b/libjava/testsuite/libjava.compile/rh174912.java
new file mode 100644
index 0000000000000000000000000000000000000000..65c1bf574ab3126a288036a0e11bf4957b67119b
--- /dev/null
+++ b/libjava/testsuite/libjava.compile/rh174912.java
@@ -0,0 +1,17 @@
+// Derived from Red Hat bugzilla 174912
+// https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174912
+// The bug is that the anonymous class constructor here will end up
+// with a bogus '[3C' in its signature.
+
+public class rh174912 {
+  public rh174912(char[][] args) { }
+
+  public Object m() {
+    return new rh174912(new char[][] { "hi".toCharArray(),
+				       "bob".toCharArray(),
+				       "and joe".toCharArray() }) {
+      };
+  }
+
+  public static void main(String[] args) { }
+}