diff --git a/src/service/poc_mobile.proto b/src/service/poc_mobile.proto
index b228ea07..3c903cce 100644
--- a/src/service/poc_mobile.proto
+++ b/src/service/poc_mobile.proto
@@ -95,8 +95,8 @@ message radio_hex_signal_level {
   // H3 resolution 12 hex tile covered by the radio
   string location = 1;
   signal_level signal_level = 2;
-  // Signal power of the radio in dBm (decibel-milliwatts)
-  double signal_power = 3;
+  // Signal power of the radio in ddBm
+  sint32 signal_power = 3;
 }
 
 message coverage_object_req_v1 {