diff --git a/llvm/tools/llvm-profgen/PerfReader.cpp b/llvm/tools/llvm-profgen/PerfReader.cpp
--- a/llvm/tools/llvm-profgen/PerfReader.cpp
+++ b/llvm/tools/llvm-profgen/PerfReader.cpp
@@ -650,6 +650,8 @@
       // Canonicalize stack leaf to avoid 'random' IP from leaf frame skew LBR
       // ranges
       Sample->CallStack.front() = Sample->LBRStack[0].Target;
+      if(IgnoreStackSamples)
+        Sample->CallStack.clear();
       // Record samples by aggregation
       AggregatedSamples[Hashable<PerfSample>(Sample)] += Count;
     }