diff --git a/frigate/util/services.py b/frigate/util/services.py
index e989ff5fa..c63b2cb34 100644
--- a/frigate/util/services.py
+++ b/frigate/util/services.py
@@ -230,7 +230,7 @@ def is_vaapi_amd_driver() -> bool:
         return any("AMD Radeon Graphics" in line for line in output)
 
 
-def get_amd_gpu_stats() -> dict[str, str]:
+def get_amd_gpu_stats() -> Optional[dict[str, str]]:
     """Get stats using radeontop."""
     radeontop_command = ["radeontop", "-d", "-", "-l", "1"]
 
@@ -256,7 +256,7 @@ def get_amd_gpu_stats() -> dict[str, str]:
         return results
 
 
-def get_intel_gpu_stats(sriov: bool) -> dict[str, str]:
+def get_intel_gpu_stats(sriov: bool) -> Optional[dict[str, str]]:
     """Get stats using intel_gpu_top."""
 
     def get_stats_manually(output: str) -> dict[str, str]:
@@ -382,7 +382,7 @@ def get_intel_gpu_stats(sriov: bool) -> dict[str, str]:
         return results
 
 
-def get_rockchip_gpu_stats() -> dict[str, str]:
+def get_rockchip_gpu_stats() -> Optional[dict[str, str]]:
     """Get GPU stats using rk."""
     try:
         with open("/sys/kernel/debug/rkrga/load", "r") as f:
@@ -403,7 +403,7 @@ def get_rockchip_gpu_stats() -> dict[str, str]:
     return {"gpu": average_load, "mem": "-"}
 
 
-def get_rockchip_npu_stats() -> dict[str, str]:
+def get_rockchip_npu_stats() -> Optional[dict[str, float | str]]:
     """Get NPU stats using rk."""
     try:
         with open("/sys/kernel/debug/rknpu/load", "r") as f:
@@ -494,7 +494,7 @@ def get_nvidia_gpu_stats() -> dict[int, dict]:
         return results
 
 
-def get_jetson_stats() -> dict[int, dict]:
+def get_jetson_stats() -> Optional[dict[int, dict]]:
     results = {}
 
     try: