diff --git a/configure.ac b/configure.ac
index 32a6ecc..96b23f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -140,12 +140,12 @@
 AC_DEFINE_UNQUOTED([OCC_MASTER_NAME], ["$OCC_MASTER_NAME"], [The OCC master object name])
 
 AC_ARG_VAR(OCC_CPU_TEMP_SENSOR_TYPE, [The CPU temp sensor type])
-AS_IF([test "x$OCC_CPU_TEMP_SENSOR_TYPE" == "x"], [OCC_CPU_TEMP_SENSOR_TYPE="C0"])
-AC_DEFINE_UNQUOTED([OCC_CPU_TEMP_SENSOR_TYPE], ["$OCC_CPU_TEMP_SENSOR_TYPE"], [The CPU temp sensor type])
+AS_IF([test "x$OCC_CPU_TEMP_SENSOR_TYPE" == "x"], [OCC_CPU_TEMP_SENSOR_TYPE=0xC0])
+AC_DEFINE_UNQUOTED([OCC_CPU_TEMP_SENSOR_TYPE], [$OCC_CPU_TEMP_SENSOR_TYPE], [The CPU temp sensor type])
 
 AC_ARG_VAR(OCC_DIMM_TEMP_SENSOR_TYPE, [The dimm temp sensor type])
-AS_IF([test "x$OCC_DIMM_TEMP_SENSOR_TYPE" == "x"], [OCC_DIMM_TEMP_SENSOR_TYPE="D0"])
-AC_DEFINE_UNQUOTED([OCC_DIMM_TEMP_SENSOR_TYPE], ["$OCC_DIMM_TEMP_SENSOR_TYPE"], [The dimm temp sensor type])
+AS_IF([test "x$OCC_DIMM_TEMP_SENSOR_TYPE" == "x"], [OCC_DIMM_TEMP_SENSOR_TYPE=0xD0])
+AC_DEFINE_UNQUOTED([OCC_DIMM_TEMP_SENSOR_TYPE], [$OCC_DIMM_TEMP_SENSOR_TYPE], [The dimm temp sensor type])
 
 AC_ARG_VAR(OCC_HWMON_PATH, [The OCC hwmon path])
 AC_ARG_VAR(DEV_PATH, [The device path])