diff --git a/src/spirv/spirv_module.cpp b/src/spirv/spirv_module.cpp
index 78de2826..4cb09727 100644
--- a/src/spirv/spirv_module.cpp
+++ b/src/spirv/spirv_module.cpp
@@ -1648,6 +1648,25 @@ namespace dxvk {
     m_code.putWord(operand);
     return resultId;
   }
+
+
+  uint32_t SpirvModule::opFMix(
+          uint32_t                resultType,
+          uint32_t                x,
+          uint32_t                y,
+          uint32_t                a) {
+    uint32_t resultId = this->allocateId();
+    
+    m_code.putIns (spv::OpExtInst, 8);
+    m_code.putWord(resultType);
+    m_code.putWord(resultId);
+    m_code.putWord(m_instExtGlsl450);
+    m_code.putWord(spv::GLSLstd450FMix);
+    m_code.putWord(x);
+    m_code.putWord(y);
+    m_code.putWord(a);
+    return resultId;
+  }
   
   
   uint32_t SpirvModule::opIAdd(
diff --git a/src/spirv/spirv_module.h b/src/spirv/spirv_module.h
index 38f9ed37..47a086ab 100644
--- a/src/spirv/spirv_module.h
+++ b/src/spirv/spirv_module.h
@@ -608,6 +608,12 @@ namespace dxvk {
     uint32_t opFAbs(
             uint32_t                resultType,
             uint32_t                operand);
+
+    uint32_t opFMix(
+            uint32_t                resultType,
+            uint32_t                x,
+            uint32_t                y,
+            uint32_t                a);
     
     uint32_t opIAdd(
             uint32_t                resultType,