diff --git a/portable/ThirdParty/GCC/Posix/port.c b/portable/ThirdParty/GCC/Posix/port.c
index 5dc7f45f8f..ac45b7d69a 100644
--- a/portable/ThirdParty/GCC/Posix/port.c
+++ b/portable/ThirdParty/GCC/Posix/port.c
@@ -261,7 +261,7 @@ void vPortStartFirstTask( void )
  */
 BaseType_t xPortStartScheduler( void )
 {
-    int iSignal;
+    int iSignal = 0;
     sigset_t xSignals;
 
     hMainThread = pthread_self();
@@ -287,6 +287,19 @@ BaseType_t xPortStartScheduler( void )
     while( xSchedulerEnd != pdTRUE )
     {
         sigwait( &xSignals, &iSignal );
+
+        #if __APPLE__
+            /* For some reason, on macOS when running in LLDB, sigwait() doesn't
+            * always clear the signal the first time. Clear it again if it's still
+            * pending.
+            */
+            sigset_t set;
+            sigpending( &set );
+            if( sigismember( &set, SIG_RESUME ) )
+            {
+                sigwait( &xSignals, &iSignal );
+            }
+        #endif /* __APPLE__ */
     }
 
     /*