diff --git a/homeassistant/components/modbus/base_platform.py b/homeassistant/components/modbus/base_platform.py
index 07704508a26cd4..4539a4e496c515 100644
--- a/homeassistant/components/modbus/base_platform.py
+++ b/homeassistant/components/modbus/base_platform.py
@@ -236,7 +236,7 @@ def unpack_structure_result(self, registers: list[int]) -> str | None:
                 if isinstance(v_temp, int) and self._precision == 0:
                     v_result.append(str(v_temp))
                 elif v_temp is None:
-                    v_result.append("nan")
+                    v_result.append("0")
                 elif v_temp != v_temp:  # noqa: PLR0124
                     # NaN float detection replace with None
                     v_result.append("nan")