diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 8c881a2c58..3ee875d6c8 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,7 @@
+2019-06-03  Alan Modra  <amodra@gmail.com>
+
+	* ppc-dis.c (prefix_opcd_indices): Correct size.
+
 2019-05-28  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR gas/24625
diff --git a/opcodes/ppc-dis.c b/opcodes/ppc-dis.c
index 9334be2138..2f5756b6cc 100644
--- a/opcodes/ppc-dis.c
+++ b/opcodes/ppc-dis.c
@@ -382,7 +382,7 @@ powerpc_init_dialect (struct disassemble_info *info)
 #define PPC_OPCD_SEGS (1 + PPC_OP (-1))
 static unsigned short powerpc_opcd_indices[PPC_OPCD_SEGS + 1];
 #define PREFIX_OPCD_SEGS (1 + PPC_PREFIX_SEG (-1))
-static unsigned short prefix_opcd_indices[PPC_OPCD_SEGS+1];
+static unsigned short prefix_opcd_indices[PREFIX_OPCD_SEGS + 1];
 #define VLE_OPCD_SEGS (1 + VLE_OP_TO_SEG (VLE_OP (-1, 0xffff)))
 static unsigned short vle_opcd_indices[VLE_OPCD_SEGS + 1];
 #define SPE2_OPCD_SEGS (1 + SPE2_XOP_TO_SEG (SPE2_XOP (-1)))