diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index 7d6c4dc0bfc..187b108048a 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -438,8 +438,8 @@ namespace {
   static unsigned int
   powerOf5(integerPart *dst, unsigned int power)
   {
-    static integerPart firstEightPowers[] = { 1, 5, 25, 125, 625, 3125,
-                                              15625, 78125 };
+    static const integerPart firstEightPowers[] = { 1, 5, 25, 125, 625, 3125,
+                                                    15625, 78125 };
     static integerPart pow5s[maxPowerOfFiveParts * 2 + 5] = { 78125 * 5 };
     static unsigned int partsCount[16] = { 1 };