diff --git a/juce_amalgamated.cpp b/juce_amalgamated.cpp
index fdc4ccc5b3..95b2017942 100644
--- a/juce_amalgamated.cpp
+++ b/juce_amalgamated.cpp
@@ -14325,7 +14325,7 @@ void ReadWriteLock::exitRead() const throw()
     {
         if (readerThreads.getUnchecked(i) == threadId)
         {
-            const int newCount = ((int) (Thread::ThreadID) readerThreads.getUnchecked (i + 1)) - 1;
+            const pointer_sized_int newCount = ((pointer_sized_int) readerThreads.getUnchecked (i + 1)) - 1;
 
             if (newCount == 0)
             {
@@ -14334,7 +14334,7 @@ void ReadWriteLock::exitRead() const throw()
             }
             else
             {
-                readerThreads.set (i + 1, (Thread::ThreadID) (pointer_sized_int) newCount);
+                readerThreads.set (i + 1, (Thread::ThreadID) newCount);
             }
 
             return;
diff --git a/src/juce_core/threads/juce_ReadWriteLock.cpp b/src/juce_core/threads/juce_ReadWriteLock.cpp
index 01d6630c03..7f5b550fd1 100644
--- a/src/juce_core/threads/juce_ReadWriteLock.cpp
+++ b/src/juce_core/threads/juce_ReadWriteLock.cpp
@@ -99,7 +99,7 @@ void ReadWriteLock::exitRead() const throw()
     {
         if (readerThreads.getUnchecked(i) == threadId)
         {
-            const int newCount = ((int) (Thread::ThreadID) readerThreads.getUnchecked (i + 1)) - 1;
+            const pointer_sized_int newCount = ((pointer_sized_int) readerThreads.getUnchecked (i + 1)) - 1;
 
             if (newCount == 0)
             {
@@ -108,7 +108,7 @@ void ReadWriteLock::exitRead() const throw()
             }
             else
             {
-                readerThreads.set (i + 1, (Thread::ThreadID) (pointer_sized_int) newCount);
+                readerThreads.set (i + 1, (Thread::ThreadID) newCount);
             }
 
             return;