diff --git a/llvm/lib/CodeGen/StackSlotColoring.cpp b/llvm/lib/CodeGen/StackSlotColoring.cpp
index 6e1c9fd16717..2f81bea4e86b 100644
--- a/llvm/lib/CodeGen/StackSlotColoring.cpp
+++ b/llvm/lib/CodeGen/StackSlotColoring.cpp
@@ -287,8 +287,10 @@ void StackSlotColoring::InitializeSlots() {
 
     auto StackID = MFI->getStackID(FI);
     if (StackID != 0) {
-      AllColors.resize(StackID + 1);
-      UsedColors.resize(StackID + 1);
+      if (StackID >= AllColors.size()) {
+        AllColors.resize(StackID + 1);
+        UsedColors.resize(StackID + 1);
+      }
       AllColors[StackID].resize(LastFI);
       UsedColors[StackID].resize(LastFI);
     }