diff --git a/src/messaging/tests/TestReliableMessageProtocol.cpp b/src/messaging/tests/TestReliableMessageProtocol.cpp
index fac5623d2524c0..a4bdd10aefe05c 100644
--- a/src/messaging/tests/TestReliableMessageProtocol.cpp
+++ b/src/messaging/tests/TestReliableMessageProtocol.cpp
@@ -179,7 +179,7 @@ class MockSessionEstablishmentDelegate : public ExchangeDelegate
 
 void test_os_sleep_ms(uint64_t millisecs)
 {
-    usleep((useconds_t)(millisecs * 1000));
+    usleep(static_cast<useconds_t>(millisecs * 1000));
 }
 
 void CheckAddClearRetrans(nlTestSuite * inSuite, void * inContext)
diff --git a/src/platform/tests/TestPlatformMgr.cpp b/src/platform/tests/TestPlatformMgr.cpp
index cf1716110bb7c6..c825964d9bec9f 100644
--- a/src/platform/tests/TestPlatformMgr.cpp
+++ b/src/platform/tests/TestPlatformMgr.cpp
@@ -98,7 +98,7 @@ static bool sleepRan;
 
 static void SleepSome(intptr_t)
 {
-    usleep((useconds_t)(1 * 1000 * 1000));
+    usleep(static_cast<useconds_t>(1 * 1000 * 1000));
     sleepRan = true;
 }
 
diff --git a/src/platform/tests/TestPlatformTime.cpp b/src/platform/tests/TestPlatformTime.cpp
index a489dad7f69b51..8f245f736b5460 100644
--- a/src/platform/tests/TestPlatformTime.cpp
+++ b/src/platform/tests/TestPlatformTime.cpp
@@ -72,7 +72,7 @@ static const struct time_test_vector test_vector_system_time_us[] = {
 
 void test_os_sleep_us(uint64_t microsecs)
 {
-    usleep(microsecs);
+    usleep(static_cast<useconds_t>(microsecs));
 }
 
 void test_os_sleep_ms(uint64_t millisecs)
diff --git a/src/protocols/secure_channel/tests/TestPASESession.cpp b/src/protocols/secure_channel/tests/TestPASESession.cpp
index faf99d437de4c8..7f432092bc5926 100644
--- a/src/protocols/secure_channel/tests/TestPASESession.cpp
+++ b/src/protocols/secure_channel/tests/TestPASESession.cpp
@@ -44,7 +44,7 @@ using TestContext = chip::Test::MessagingContext;
 
 static void test_os_sleep_ms(uint64_t millisecs)
 {
-    usleep((useconds_t) millisecs * 1000);
+    usleep(static_cast<useconds_t>(millisecs * 1000));
 }
 
 class PASETestLoopbackTransport : public Test::LoopbackTransport