diff --git a/src/spirv/spirv_module.cpp b/src/spirv/spirv_module.cpp
index efd520adc..7811bae9a 100644
--- a/src/spirv/spirv_module.cpp
+++ b/src/spirv/spirv_module.cpp
@@ -1793,6 +1793,21 @@ namespace dxvk {
   }
 
 
+    uint32_t SpirvModule::opFSign(
+          uint32_t                resultType,
+          uint32_t                operand) {
+    uint32_t resultId = this->allocateId();
+
+    m_code.putIns (spv::OpExtInst, 6);
+    m_code.putWord(resultType);
+    m_code.putWord(resultId);
+    m_code.putWord(m_instExtGlsl450);
+    m_code.putWord(spv::GLSLstd450FSign);
+    m_code.putWord(operand);
+    return resultId;
+  }
+
+
   uint32_t SpirvModule::opFMix(
           uint32_t                resultType,
           uint32_t                x,
diff --git a/src/spirv/spirv_module.h b/src/spirv/spirv_module.h
index 007da72a8..7ce5b8f15 100644
--- a/src/spirv/spirv_module.h
+++ b/src/spirv/spirv_module.h
@@ -654,6 +654,10 @@ namespace dxvk {
             uint32_t                resultType,
             uint32_t                operand);
 
+    uint32_t opFSign(
+            uint32_t                resultType,
+            uint32_t                operand);
+
     uint32_t opFMix(
             uint32_t                resultType,
             uint32_t                x,