diff --git a/src/writer/glsl/generator_impl.cc b/src/writer/glsl/generator_impl.cc
index 55b5098a50..91fb6dc5ee 100644
--- a/src/writer/glsl/generator_impl.cc
+++ b/src/writer/glsl/generator_impl.cc
@@ -1174,7 +1174,6 @@ std::string GeneratorImpl::generate_builtin_name(
     case sem::IntrinsicType::kAny:
     case sem::IntrinsicType::kAsin:
     case sem::IntrinsicType::kAtan:
-    case sem::IntrinsicType::kAtan2:
     case sem::IntrinsicType::kCeil:
     case sem::IntrinsicType::kClamp:
     case sem::IntrinsicType::kCos:
@@ -1209,6 +1208,8 @@ std::string GeneratorImpl::generate_builtin_name(
     case sem::IntrinsicType::kTranspose:
     case sem::IntrinsicType::kTrunc:
       return intrinsic->str();
+    case sem::IntrinsicType::kAtan2:
+      return "atan";
     case sem::IntrinsicType::kCountOneBits:
       return "countbits";
     case sem::IntrinsicType::kDpdx:
diff --git a/src/writer/glsl/generator_impl_import_test.cc b/src/writer/glsl/generator_impl_import_test.cc
index 6e6ee73a2f..9f4dddf9db 100644
--- a/src/writer/glsl/generator_impl_import_test.cc
+++ b/src/writer/glsl/generator_impl_import_test.cc
@@ -145,7 +145,7 @@ TEST_P(GlslImportData_DualParam_ScalarTest, Float) {
 }
 INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                          GlslImportData_DualParam_ScalarTest,
-                         testing::Values(GlslImportData{"atan2", "atan2"},
+                         testing::Values(GlslImportData{"atan2", "atan"},
                                          GlslImportData{"distance", "distance"},
                                          GlslImportData{"max", "max"},
                                          GlslImportData{"min", "min"},
@@ -169,7 +169,7 @@ TEST_P(GlslImportData_DualParam_VectorTest, Float) {
 }
 INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                          GlslImportData_DualParam_VectorTest,
-                         testing::Values(GlslImportData{"atan2", "atan2"},
+                         testing::Values(GlslImportData{"atan2", "atan"},
                                          GlslImportData{"cross", "cross"},
                                          GlslImportData{"distance", "distance"},
                                          GlslImportData{"max", "max"},
diff --git a/src/writer/glsl/generator_impl_intrinsic_test.cc b/src/writer/glsl/generator_impl_intrinsic_test.cc
index fc8183be9c..35333de19a 100644
--- a/src/writer/glsl/generator_impl_intrinsic_test.cc
+++ b/src/writer/glsl/generator_impl_intrinsic_test.cc
@@ -192,7 +192,7 @@ INSTANTIATE_TEST_SUITE_P(
         IntrinsicData{IntrinsicType::kAny, ParamType::kBool, "any"},
         IntrinsicData{IntrinsicType::kAsin, ParamType::kF32, "asin"},
         IntrinsicData{IntrinsicType::kAtan, ParamType::kF32, "atan"},
-        IntrinsicData{IntrinsicType::kAtan2, ParamType::kF32, "atan2"},
+        IntrinsicData{IntrinsicType::kAtan2, ParamType::kF32, "atan"},
         IntrinsicData{IntrinsicType::kCeil, ParamType::kF32, "ceil"},
         IntrinsicData{IntrinsicType::kClamp, ParamType::kF32, "clamp"},
         IntrinsicData{IntrinsicType::kClamp, ParamType::kU32, "clamp"},