diff --git a/lib/Target/R600/R600ControlFlowFinalizer.cpp b/lib/Target/R600/R600ControlFlowFinalizer.cpp
index 832c375bf5b..f2296133074 100644
--- a/lib/Target/R600/R600ControlFlowFinalizer.cpp
+++ b/lib/Target/R600/R600ControlFlowFinalizer.cpp
@@ -340,6 +340,7 @@ public:
         BuildMI(MBB, MBB.begin(), MBB.findDebugLoc(MBB.begin()),
             getHWInstrDesc(CF_CALL_FS));
         CfCount++;
+        MaxStack = 1;
       }
       std::vector<ClauseFile> FetchClauses, AluClauses;
       for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();