diff --git a/src/ImplicitCudaHeaders.cpp b/src/ImplicitCudaHeaders.cpp
new file mode 100644
index 00000000..11ca4149
--- /dev/null
+++ b/src/ImplicitCudaHeaders.cpp
@@ -0,0 +1,37 @@
+/*
+Copyright (c) 2026 - present Advanced Micro Devices, Inc. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include "ImplicitCudaHeaders.h"
+#include "clang/Tooling/ArgumentsAdjusters.h"
+
+namespace hipify {
+
+static const char *const ImplicitCudaHeader = "cuda_runtime.h";
+
+void addImplicitCudaHeaders(ct::RefactoringTool &Tool) {
+  Tool.appendArgumentsAdjuster(ct::getInsertArgumentAdjuster(
+      ImplicitCudaHeader, ct::ArgumentInsertPosition::BEGIN));
+  Tool.appendArgumentsAdjuster(ct::getInsertArgumentAdjuster(
+      "-include", ct::ArgumentInsertPosition::BEGIN));
+}
+
+} // namespace hipify
diff --git a/src/ImplicitCudaHeaders.h b/src/ImplicitCudaHeaders.h
new file mode 100644
index 00000000..3c3a1e9c
--- /dev/null
+++ b/src/ImplicitCudaHeaders.h
@@ -0,0 +1,44 @@
+/*
+Copyright (c) 2026 - present Advanced Micro Devices, Inc. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#pragma once
+
+#include "clang/Tooling/Refactoring.h"
+
+namespace ct = clang::tooling;
+
+namespace hipify {
+
+/// nvcc automatically pre-includes certain CUDA headers at the beginning of
+/// any compilation unit.
+///
+/// The primary header is cuda_runtime.h, which transitively includes:
+///   - host_config.h      (System configuration)
+///   - builtin_types.h    (Basic CUDA types)
+///   - device_types.h     (Device enums and structs)
+///   - host_defines.h     (Macro definitions)
+///   - driver_types.h     (Driver types)
+///   - vector_types.h     (float3, int2, etc.)
+
+void addImplicitCudaHeaders(ct::RefactoringTool &Tool);
+
+} // namespace hipify
diff --git a/src/main.cpp b/src/main.cpp
index b7c866ce..0675bdfc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -44,6 +44,7 @@ THE SOFTWARE.
 #endif
 
 #include "LocalHeader.h"
+#include "ImplicitCudaHeaders.h"
 
 #if LLVM_VERSION_MAJOR < 8
 #include "llvm/Support/Path.h"
@@ -221,6 +222,9 @@ bool appendArgumentsAdjusters(ct::RefactoringTool &Tool, const std::string &sSou
     std::string sCudaPath = "--cuda-path=" + CudaPath;
     Tool.appendArgumentsAdjuster(ct::getInsertArgumentAdjuster(sCudaPath.c_str(), ct::ArgumentInsertPosition::BEGIN));
   }
+
+  // Implicit CUDA headers to mimic nvcc behavior
+  hipify::addImplicitCudaHeaders(Tool);
   llcompat::addTargetIfNeeded(Tool);
   Tool.appendArgumentsAdjuster(ct::getInsertArgumentAdjuster("cuda", ct::ArgumentInsertPosition::BEGIN));
   Tool.appendArgumentsAdjuster(ct::getInsertArgumentAdjuster("-x", ct::ArgumentInsertPosition::BEGIN));