diff --git a/numba_cuda/numba/cuda/cudadrv/driver.py b/numba_cuda/numba/cuda/cudadrv/driver.py
index 0748931..fe46630 100644
--- a/numba_cuda/numba/cuda/cudadrv/driver.py
+++ b/numba_cuda/numba/cuda/cudadrv/driver.py
@@ -2667,19 +2667,38 @@ def add_cu_file(self, path):
             cu = f.read()
         self.add_cu(cu, os.path.basename(path))
 
-    def add_file_guess_ext(self, path):
+    def add_file_guess_ext(self, path_or_code):
         """Add a file to the link, guessing its type from its extension."""
-        ext = os.path.splitext(path)[1][1:]
-        if ext == '':
-            raise RuntimeError("Don't know how to link file with no extension")
-        elif ext == 'cu':
-            self.add_cu_file(path)
-        else:
-            kind = FILE_EXTENSION_MAP.get(ext, None)
-            if kind is None:
-                raise RuntimeError("Don't know how to link file with extension "
-                                   f".{ext}")
-            self.add_file(path, kind)
+        if isinstance(path_or_code, str):
+            ext = pathlib.Path(path_or_code).suffix
+            if ext == '':
+                raise RuntimeError(
+                    "Don't know how to link file with no extension"
+                )
+            elif ext == '.cu':
+                self.add_cu_file(path_or_code)
+            else:
+                kind = FILE_EXTENSION_MAP.get(ext, None)
+                if kind is None:
+                    raise RuntimeError(
+                        "Don't know how to link file with extension "
+                        f".{ext}"
+                    )
+                self.add_file(path_or_code, kind)
+            return
+        else:
+            # Otherwise, we should have been given a LinkableCode object
+            if not isinstance(path_or_code, LinkableCode):
+                raise TypeError(
+                    "Expected path to file or a LinkableCode object"
+                )
+
+            if path_or_code.kind == "cu":
+                self.add_cu(path_or_code.data, path_or_code.name)
+            else:
+                self.add_data(
+                    path_or_code.data, path_or_code.kind, path_or_code.name
+                )
 
     @abstractmethod
     def complete(self):
@@ -3017,36 +3036,6 @@ def add_ltoir(self, ltoir, name="<external-ltoir>"):
     def add_object(self, obj, name="<external-object>"):
         self._linker.add_object(obj, name)
 
-    def add_file_guess_ext(self, path_or_code):
-        # Numba's add_file_guess_ext expects to always be passed a path to a
-        # file that it will load from the filesystem to link. We augment it
-        # here with the ability to provide a file from memory.
-
-        # To maintain compatibility with the original interface, all strings
-        # are treated as paths in the filesystem.
-        if isinstance(path_or_code, str):
-            # Upstream numba does not yet recognize LTOIR, so handle that
-            # separately here.
-            extension = pathlib.Path(path_or_code).suffix
-            if extension == ".ltoir":
-                self.add_file(path_or_code, "ltoir")
-            else:
-                # Use Numba's logic for non-LTOIR
-                super().add_file_guess_ext(path_or_code)
-
-            return
-
-        # Otherwise, we should have been given a LinkableCode object
-        if not isinstance(path_or_code, LinkableCode):
-            raise TypeError("Expected path to file or a LinkableCode object")
-
-        if path_or_code.kind == "cu":
-            self.add_cu(path_or_code.data, path_or_code.name)
-        else:
-            self.add_data(
-                path_or_code.data, path_or_code.kind, path_or_code.name
-            )
-
     def add_file(self, path, kind):
         try:
             with open(path, "rb") as f:
diff --git a/numba_cuda/numba/cuda/cudadrv/enums.py b/numba_cuda/numba/cuda/cudadrv/enums.py
index 3431cf7..917dbb1 100644
--- a/numba_cuda/numba/cuda/cudadrv/enums.py
+++ b/numba_cuda/numba/cuda/cudadrv/enums.py
@@ -309,7 +309,10 @@
 # Applicable options: PTX compiler options, ::CU_JIT_FALLBACK_STRATEGY
 CU_JIT_INPUT_LIBRARY = 4
 
-CU_JIT_NUM_INPUT_TYPES = 6
+# LTO IR
+CU_JIT_INPUT_LTO_IR = 5
+
+CU_JIT_NUM_INPUT_TYPES = 7
 
 
 # Online compiler and linker options
diff --git a/numba_cuda/numba/cuda/cudadrv/mappings.py b/numba_cuda/numba/cuda/cudadrv/mappings.py
index 3750324..15fe79b 100644
--- a/numba_cuda/numba/cuda/cudadrv/mappings.py
+++ b/numba_cuda/numba/cuda/cudadrv/mappings.py
@@ -19,4 +19,5 @@
         'lib': enums.CU_JIT_INPUT_LIBRARY,
         'cubin': enums.CU_JIT_INPUT_CUBIN,
         'fatbin': enums.CU_JIT_INPUT_FATBINARY,
+        'ltoir': enums.CU_JIT_INPUT_LTO_IR,
     }