diff --git a/script/make-pretty b/script/make-pretty
index 28214113f..b824f5a23 100755
--- a/script/make-pretty
+++ b/script/make-pretty
@@ -119,6 +119,7 @@ readonly OT_CLANG_TIDY_CHECKS="\
 modernize-use-bool-literals,\
 modernize-use-nullptr,\
 readability-make-member-function-const,\
+readability-simplify-boolean-expr,\
 "
 
 #performance-for-range-copy\
diff --git a/src/core/mac/mac.cpp b/src/core/mac/mac.cpp
index 64df219fd..abe7010d4 100644
--- a/src/core/mac/mac.cpp
+++ b/src/core/mac/mac.cpp
@@ -2291,7 +2291,7 @@ void Mac::SetCslChannel(uint8_t aChannel)
     VerifyOrExit(GetCslChannel() != aChannel);
 
     mSubMac.SetCslChannel(aChannel);
-    mSubMac.SetCslChannelSpecified(aChannel != 0 ? true : false);
+    mSubMac.SetCslChannelSpecified(aChannel != 0);
 
     if (IsCslEnabled())
     {
diff --git a/src/ncp/ncp_base_mtd.cpp b/src/ncp/ncp_base_mtd.cpp
index 10c123c07..b5371bb4f 100644
--- a/src/ncp/ncp_base_mtd.cpp
+++ b/src/ncp/ncp_base_mtd.cpp
@@ -277,9 +277,9 @@ template <> otError NcpBase::HandlePropertySet<SPINEL_PROP_NET_STACK_UP>(void)
     SuccessOrExit(error = mDecoder.ReadBool(enabled));
 
     // If the value has changed...
-    if ((enabled != false) != (otThreadGetDeviceRole(mInstance) != OT_DEVICE_ROLE_DISABLED))
+    if (enabled != (otThreadGetDeviceRole(mInstance) != OT_DEVICE_ROLE_DISABLED))
     {
-        if (enabled != false)
+        if (enabled)
         {
             error = otThreadSetEnabled(mInstance, true);
             StartLegacy();
@@ -679,7 +679,7 @@ template <> otError NcpBase::HandlePropertySet<SPINEL_PROP_THREAD_ALLOW_LOCAL_NE
     SuccessOrExit(error = mDecoder.ReadBool(value));
 
     // Register any net data changes on transition from `true` to `false`.
-    shouldRegisterWithLeader = (mAllowLocalNetworkDataChange == true) && (value == false);
+    shouldRegisterWithLeader = mAllowLocalNetworkDataChange && !value;
 
     mAllowLocalNetworkDataChange = value;
 
@@ -819,7 +819,7 @@ template <> otError NcpBase::HandlePropertySet<SPINEL_PROP_SERVER_ALLOW_LOCAL_DA
     SuccessOrExit(error = mDecoder.ReadBool(value));
 
     // Register any server data changes on transition from `true` to `false`.
-    shouldRegisterWithLeader = (mAllowLocalServerDataChange == true) && (value == false);
+    shouldRegisterWithLeader = mAllowLocalServerDataChange && !value;
 
     mAllowLocalServerDataChange = value;
 
@@ -1467,7 +1467,7 @@ template <> otError NcpBase::HandlePropertySet<SPINEL_PROP_MESHCOP_JOINER_COMMIS
 
     SuccessOrExit(error = mDecoder.ReadBool(action));
 
-    if (action == false)
+    if (!action)
     {
         otJoinerStop(mInstance);
         ExitNow();
diff --git a/src/ncp/ncp_base_radio.cpp b/src/ncp/ncp_base_radio.cpp
index 6c00fd513..cac86387f 100644
--- a/src/ncp/ncp_base_radio.cpp
+++ b/src/ncp/ncp_base_radio.cpp
@@ -346,7 +346,7 @@ template <> otError NcpBase::HandlePropertySet<SPINEL_PROP_PHY_ENABLED>(void)
 
     SuccessOrExit(error = mDecoder.ReadBool(value));
 
-    if (value == false)
+    if (!value)
     {
         error = otLinkRawSetReceiveDone(mInstance, nullptr);
     }