diff --git a/src/modules/rc_update/rc_update.cpp b/src/modules/rc_update/rc_update.cpp
index af4931c472..17fb21dea0 100644
--- a/src/modules/rc_update/rc_update.cpp
+++ b/src/modules/rc_update/rc_update.cpp
@@ -72,23 +72,23 @@ RCUpdate::RCUpdate() :
 		char nbuf[16];
 
 		/* min values */
-		sprintf(nbuf, "RC%d_MIN", i + 1);
+		snprintf(nbuf, sizeof(nbuf), "RC%d_MIN", i + 1);
 		_parameter_handles.min[i] = param_find(nbuf);
 
 		/* trim values */
-		sprintf(nbuf, "RC%d_TRIM", i + 1);
+		snprintf(nbuf, sizeof(nbuf), "RC%d_TRIM", i + 1);
 		_parameter_handles.trim[i] = param_find(nbuf);
 
 		/* max values */
-		sprintf(nbuf, "RC%d_MAX", i + 1);
+		snprintf(nbuf, sizeof(nbuf), "RC%d_MAX", i + 1);
 		_parameter_handles.max[i] = param_find(nbuf);
 
 		/* channel reverse */
-		sprintf(nbuf, "RC%d_REV", i + 1);
+		snprintf(nbuf, sizeof(nbuf), "RC%d_REV", i + 1);
 		_parameter_handles.rev[i] = param_find(nbuf);
 
 		/* channel deadzone */
-		sprintf(nbuf, "RC%d_DZ", i + 1);
+		snprintf(nbuf, sizeof(nbuf), "RC%d_DZ", i + 1);
 		_parameter_handles.dz[i] = param_find(nbuf);
 	}