diff --git a/stempayload/payload_pico/payload_pico.ino b/stempayload/payload_pico/payload_pico.ino
index 5121d237..545a5464 100644
--- a/stempayload/payload_pico/payload_pico.ino
+++ b/stempayload/payload_pico/payload_pico.ino
@@ -524,7 +524,7 @@ void payload_OK_only()
     if (newData)
   {
     Serial.printf("GPS read new data in ms: %d\n", millis() - start);	    
-    float flon, flat, flalt;
+    float flon = 0.0, flat = 0.0, flalt = 0.0;
     unsigned long age;
     starting = millis();	    
 //    gps.f_get_position(&flat, &flon, &age);