diff --git a/include/libs/scalar/scalar.h b/include/libs/scalar/scalar.h
index a6ed944632..dfdb69ee3c 100644
--- a/include/libs/scalar/scalar.h
+++ b/include/libs/scalar/scalar.h
@@ -113,6 +113,7 @@ int32_t twaScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *
 int32_t mavgScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 int32_t hllScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 int32_t csumScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t diffScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 185f529963..10e0808c4d 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -2408,6 +2408,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getDiffFuncEnv,
     .initFunc     = diffFunctionSetup,
     .processFunc  = diffFunction,
+    .sprocessFunc = diffScalarFunction,
     .finalizeFunc = functionFinalize
   },
   {
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index b94379c7b5..3f26cd46f8 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -2408,6 +2408,10 @@ int32_t irateScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam
   return nonCalcScalarFunction(pInput, inputNum, pOutput);
 }
 
+int32_t diffScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+  return nonCalcScalarFunction(pInput, inputNum, pOutput);
+}
+
 int32_t twaScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   return avgScalarFunction(pInput, inputNum, pOutput);
 }