diff --git a/juce_amalgamated.cpp b/juce_amalgamated.cpp
index ddcf309254..e10a65d950 100644
--- a/juce_amalgamated.cpp
+++ b/juce_amalgamated.cpp
@@ -2860,7 +2860,7 @@ void BitArray::loadFromMemoryBlock (const MemoryBlock& data) throw()
 {
 	clear();
 
-	for (size_t i = data.getSize(); --i >= 0;)
+	for (int i = (int) data.getSize(); --i >= 0;)
 		this->setBitRangeAsInt ((int) (i << 3), 8, data [i]);
 }
 
@@ -22351,6 +22351,7 @@ static bool juce_slowCopyOfWavFileWithNewMetadata (const File& file, const Strin
 
 				bool ok = writer->writeFromAudioReader (*reader, 0, -1);
 				writer = 0;
+				reader = 0;
 
 				return ok && tempFile.overwriteTargetFileWithTemporary();
 			}
diff --git a/src/audio/audio_file_formats/juce_WavAudioFormat.cpp b/src/audio/audio_file_formats/juce_WavAudioFormat.cpp
index faa2916048..3664a2bb8f 100644
--- a/src/audio/audio_file_formats/juce_WavAudioFormat.cpp
+++ b/src/audio/audio_file_formats/juce_WavAudioFormat.cpp
@@ -814,6 +814,7 @@ static bool juce_slowCopyOfWavFileWithNewMetadata (const File& file, const Strin
 
                 bool ok = writer->writeFromAudioReader (*reader, 0, -1);
                 writer = 0;
+                reader = 0;
 
                 return ok && tempFile.overwriteTargetFileWithTemporary();
             }
diff --git a/src/containers/juce_BitArray.cpp b/src/containers/juce_BitArray.cpp
index 55557c409a..1cad30b639 100644
--- a/src/containers/juce_BitArray.cpp
+++ b/src/containers/juce_BitArray.cpp
@@ -938,7 +938,7 @@ void BitArray::loadFromMemoryBlock (const MemoryBlock& data) throw()
 {
     clear();
 
-    for (size_t i = data.getSize(); --i >= 0;)
+    for (int i = (int) data.getSize(); --i >= 0;)
         this->setBitRangeAsInt ((int) (i << 3), 8, data [i]);
 }