diff --git a/src/cli/cli.cpp b/src/cli/cli.cpp
index 06762f933..47bf4d497 100644
--- a/src/cli/cli.cpp
+++ b/src/cli/cli.cpp
@@ -334,7 +334,7 @@ void Interpreter::ProcessChild(int argc, char *argv[])
     }
 
     SuccessOrExit(error = ParseLong(argv[0], value));
-    SuccessOrExit(error = otGetChildInfoById(static_cast<uint8_t>(value), &childInfo));
+    SuccessOrExit(error = otGetChildInfoById(static_cast<uint16_t>(value), &childInfo));
 
     sServer->OutputFormat("Child ID: %d\r\n", childInfo.mChildId);
     sServer->OutputFormat("Rloc: %04x\r\n", childInfo.mRloc16);
@@ -1550,7 +1550,7 @@ void Interpreter::ProcessRouter(int argc, char *argv[])
     }
 
     SuccessOrExit(error = ParseLong(argv[0], value));
-    SuccessOrExit(error = otGetRouterInfo(static_cast<uint8_t>(value), &routerInfo));
+    SuccessOrExit(error = otGetRouterInfo(static_cast<uint16_t>(value), &routerInfo));
 
     sServer->OutputFormat("Alloc: %d\r\n", routerInfo.mAllocated);