diff --git a/src/V3DfgPeephole.cpp b/src/V3DfgPeephole.cpp
index f297d45bd..ff3b42020 100644
--- a/src/V3DfgPeephole.cpp
+++ b/src/V3DfgPeephole.cpp
@@ -844,7 +844,8 @@ class V3DfgPeephole final : public DfgVisitor {
         // Sel from Cond
         if (DfgCond* const condp = fromp->cast<DfgCond>()) {
             // If at least one of the branches are a constant, push the select past the cond
-            if (condp->thenp()->is<DfgConst>() || condp->elsep()->is<DfgConst>()) {
+            if (!condp->hasMultipleSinks()
+                && (condp->thenp()->is<DfgConst>() || condp->elsep()->is<DfgConst>())) {
                 APPLYING(PUSH_SEL_THROUGH_COND) {
                     // The new 'then' vertex
                     DfgSel* const newThenp = make<DfgSel>(vtxp, condp->thenp(), lsb);