diff --git a/src/stan_math_backend/Stan_math_code_gen.ml b/src/stan_math_backend/Stan_math_code_gen.ml
index f559cc1c37..ff2e4eab99 100644
--- a/src/stan_math_backend/Stan_math_code_gen.ml
+++ b/src/stan_math_backend/Stan_math_code_gen.ml
@@ -552,6 +552,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
diff --git a/test/integration/good/code-gen/cl.expected b/test/integration/good/code-gen/cl.expected
index f74486632b..4fee50585e 100644
--- a/test/integration/good/code-gen/cl.expected
+++ b/test/integration/good/code-gen/cl.expected
@@ -74,6 +74,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
diff --git a/test/integration/good/code-gen/cpp.expected b/test/integration/good/code-gen/cpp.expected
index f8478a6c09..b7d9043b82 100644
--- a/test/integration/good/code-gen/cpp.expected
+++ b/test/integration/good/code-gen/cpp.expected
@@ -74,6 +74,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
@@ -593,6 +594,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
@@ -9316,6 +9318,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
@@ -11264,6 +11267,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
@@ -12936,6 +12940,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
@@ -13323,6 +13328,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
@@ -13805,6 +13811,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;
diff --git a/test/integration/good/compiler-optimizations/cpp.expected b/test/integration/good/compiler-optimizations/cpp.expected
index deee8ee56a..117510b475 100644
--- a/test/integration/good/compiler-optimizations/cpp.expected
+++ b/test/integration/good/compiler-optimizations/cpp.expected
@@ -74,6 +74,7 @@ using std::istream;
 using std::string;
 using std::stringstream;
 using std::vector;
+using std::pow;
 using stan::io::dump;
 using stan::math::lgamma;
 using stan::model::model_base_crtp;