diff --git a/portable/ThirdParty/GCC/RP2040/include/portmacro.h b/portable/ThirdParty/GCC/RP2040/include/portmacro.h
index d8173716eea..4e72bb07dc1 100644
--- a/portable/ThirdParty/GCC/RP2040/include/portmacro.h
+++ b/portable/ThirdParty/GCC/RP2040/include/portmacro.h
@@ -237,6 +237,11 @@ static inline void vPortRecursiveLock( BaseType_t xCoreID,
             }
             spin_lock_unsafe_blocking(pxSpinLock);
         }
+        else
+        {
+            /* spin_try_lock_unsafe() does not provide acquire ordering on the fast path. */
+            __mem_fence_acquire();
+        }
         configASSERT( ucRecursionCountByLock[ ulLockNum ] == 0 );
         ucRecursionCountByLock[ ulLockNum ] = 1;
         ucOwnedByCore[ xCoreID ][ ulLockNum ] = 1;