diff --git a/Android.mk b/Android.mk
index a6488f890..2ffa35897 100644
--- a/Android.mk
+++ b/Android.mk
@@ -51,6 +51,7 @@ SPVTOOLS_SRC_FILES := \
 		source/val/validate_debug.cpp \
 		source/val/validate_decorations.cpp \
 		source/val/validate_derivatives.cpp \
+		source/val/validate_extensions.cpp \
 		source/val/validate_ext_inst.cpp \
 		source/val/validate_execution_limitations.cpp \
 		source/val/validate_function.cpp \
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 47b368fbd..c5f07a314 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -305,6 +305,7 @@ set(SPIRV_SOURCES
   ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_debug.cpp
   ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_decorations.cpp
   ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_derivatives.cpp
+  ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_extensions.cpp
   ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_ext_inst.cpp
   ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_execution_limitations.cpp
   ${CMAKE_CURRENT_SOURCE_DIR}/val/validate_function.cpp
diff --git a/source/val/validate.cpp b/source/val/validate.cpp
index faf88a571..257c317bf 100644
--- a/source/val/validate.cpp
+++ b/source/val/validate.cpp
@@ -328,6 +328,7 @@ spv_result_t ValidateBinaryUsingContextAndValidationState(
     // Miscellaneous
     if (auto error = DebugPass(*vstate, &instruction)) return error;
     if (auto error = AnnotationPass(*vstate, &instruction)) return error;
+    if (auto error = ExtensionPass(*vstate, &instruction)) return error;
     if (auto error = ExtInstPass(*vstate, &instruction)) return error;
     if (auto error = ModeSettingPass(*vstate, &instruction)) return error;
     if (auto error = TypePass(*vstate, &instruction)) return error;
diff --git a/source/val/validate.h b/source/val/validate.h
index 13ec33550..30228f09d 100644
--- a/source/val/validate.h
+++ b/source/val/validate.h
@@ -173,6 +173,9 @@ spv_result_t BarriersPass(ValidationState_t& _, const Instruction* inst);
 /// Validates correctness of literal numbers.
 spv_result_t LiteralsPass(ValidationState_t& _, const Instruction* inst);
 
+/// Validates correctness of ExtInstImport instructions.
+spv_result_t ExtensionPass(ValidationState_t& _, const Instruction* inst);
+
 /// Validates correctness of ExtInst instructions.
 spv_result_t ExtInstPass(ValidationState_t& _, const Instruction* inst);
 
diff --git a/source/val/validate_extensions.cpp b/source/val/validate_extensions.cpp
new file mode 100644
index 000000000..f3b2305b7
--- /dev/null
+++ b/source/val/validate_extensions.cpp
@@ -0,0 +1,55 @@
+// Copyright (c) 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Validates correctness of extension SPIR-V instructions.
+
+#include "source/val/validate.h"
+
+#include <string>
+#include <vector>
+
+#include "source/diagnostic.h"
+#include "source/opcode.h"
+#include "source/spirv_target_env.h"
+#include "source/val/instruction.h"
+#include "source/val/validation_state.h"
+
+namespace spvtools {
+namespace val {
+
+spv_result_t ValidateExtInstImport(ValidationState_t& _,
+                                   const Instruction* inst) {
+  if (spvIsWebGPUEnv(_.context()->target_env)) {
+    const auto name_id = 1;
+    const std::string name(reinterpret_cast<const char*>(
+        inst->words().data() + inst->operands()[name_id].offset));
+    if (name != "GLSL.std.450") {
+      return _.diag(SPV_ERROR_INVALID_DATA, inst)
+             << "For WebGPU, the only valid parameter to OpExtInstImport is "
+                "\"GLSL.std.450\".";
+    }
+  }
+
+  return SPV_SUCCESS;
+}
+
+spv_result_t ExtensionPass(ValidationState_t& _, const Instruction* inst) {
+  const SpvOp opcode = inst->opcode();
+  if (opcode == SpvOpExtInstImport) return ValidateExtInstImport(_, inst);
+
+  return SPV_SUCCESS;
+}
+
+}  // namespace val
+}  // namespace spvtools
diff --git a/test/val/val_webgpu_test.cpp b/test/val/val_webgpu_test.cpp
index cc3f90593..ba5919850 100644
--- a/test/val/val_webgpu_test.cpp
+++ b/test/val/val_webgpu_test.cpp
@@ -219,6 +219,45 @@ TEST_F(ValidateWebGPU, NonVulkanKHRMemoryModelBad) {
                         "environment.\n  OpMemoryModel Logical GLSL450\n"));
 }
 
+TEST_F(ValidateWebGPU, WhitelistedExtendedInstructionsImportGood) {
+  std::string spirv = R"(
+          OpCapability Shader
+          OpCapability VulkanMemoryModelKHR
+          OpExtension "SPV_KHR_vulkan_memory_model"
+%1      = OpExtInstImport "GLSL.std.450"
+          OpMemoryModel Logical VulkanKHR
+          OpEntryPoint Vertex %func "shader"
+%void   = OpTypeVoid
+%void_f = OpTypeFunction %void
+%func   = OpFunction %void None %void_f
+%label  = OpLabel
+          OpReturn
+          OpFunctionEnd
+)";
+
+  CompileSuccessfully(spirv);
+
+  EXPECT_EQ(SPV_SUCCESS, ValidateInstructions(SPV_ENV_WEBGPU_0));
+}
+
+TEST_F(ValidateWebGPU, NonWhitelistedExtendedInstructionsImportBad) {
+  std::string spirv = R"(
+     OpCapability Shader
+     OpCapability VulkanMemoryModelKHR
+     OpExtension "SPV_KHR_vulkan_memory_model"
+%1 = OpExtInstImport "OpenCL.std"
+     OpMemoryModel Logical VulkanKHR
+)";
+
+  CompileSuccessfully(spirv);
+
+  EXPECT_EQ(SPV_ERROR_INVALID_DATA, ValidateInstructions(SPV_ENV_WEBGPU_0));
+  EXPECT_THAT(getDiagnosticString(),
+              HasSubstr("For WebGPU, the only valid parameter to "
+                        "OpExtInstImport is \"GLSL.std.450\".\n  %1 = "
+                        "OpExtInstImport \"OpenCL.std\"\n"));
+}
+
 }  // namespace
 }  // namespace val
 }  // namespace spvtools