diff --git a/src/shader_recompiler/frontend/translate/scalar_alu.cpp b/src/shader_recompiler/frontend/translate/scalar_alu.cpp
index e3134c300..bb685d4bf 100644
--- a/src/shader_recompiler/frontend/translate/scalar_alu.cpp
+++ b/src/shader_recompiler/frontend/translate/scalar_alu.cpp
@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <magic_enum/magic_enum.hpp>
 #include "common/assert.h"
 #include "shader_recompiler/frontend/translate/translate.h"
 
@@ -680,9 +681,18 @@ void Translator::S_FF1_I32_B32(const GcnInst& inst) {
 }
 
 void Translator::S_FF1_I32_B64(const GcnInst& inst) {
-    ASSERT(inst.src[0].field == OperandField::ScalarGPR);
-    const IR::U32 result{
-        ir.BallotFindLsb(ir.Ballot(ir.GetThreadBitScalarReg(IR::ScalarReg(inst.src[0].code))))};
+    const auto src = [&] {
+        switch (inst.src[0].field) {
+        case OperandField::ScalarGPR:
+            return ir.GetThreadBitScalarReg(IR::ScalarReg(inst.src[0].code));
+        case OperandField::VccLo:
+            return ir.GetVcc();
+        default:
+            UNREACHABLE_MSG("unhandled operand type {}", magic_enum::enum_name(inst.src[0].field));
+        }
+    }();
+    const IR::U32 result{ir.BallotFindLsb(ir.Ballot(src))};
+
     SetDst(inst.dst[0], result);
 }