diff --git a/juce_amalgamated.cpp b/juce_amalgamated.cpp
index 8ff3c9e535..7a650a815e 100644
--- a/juce_amalgamated.cpp
+++ b/juce_amalgamated.cpp
@@ -8104,8 +8104,6 @@ int64 FileInputStream::getTotalLength()
 
 int FileInputStream::read (void* buffer, int bytesToRead)
 {
-	int num = 0;
-
 	if (needToSeek)
 	{
 		if (juce_fileSetPosition (fileHandle, currentPosition) < 0)
@@ -8114,10 +8112,10 @@ int FileInputStream::read (void* buffer, int bytesToRead)
 		needToSeek = false;
 	}
 
-	num = readInternal (buffer, bytesToRead);
+	const size_t num = readInternal (buffer, bytesToRead);
 	currentPosition += num;
 
-	return num;
+	return (int) num;
 }
 
 bool FileInputStream::isExhausted()
@@ -9279,7 +9277,7 @@ namespace URLHelpers
 
 			// just a short text attachment, so use simple url encoding..
 			headers << "Content-Type: application/x-www-form-urlencoded\r\nContent-length: "
-					<< postData.getSize() << "\r\n";
+					<< (unsigned int) postData.getSize() << "\r\n";
 		}
 	}
 }
@@ -9984,7 +9982,7 @@ bool MemoryOutputStream::write (const void* const buffer, int howMany)
 		const size_t storageNeeded = position + howMany;
 
 		if (storageNeeded >= data.getSize())
-			data.ensureSize ((storageNeeded + jmin (storageNeeded / 2, (size_t) (1024 * 1024)) + 32) & ~31);
+			data.ensureSize ((storageNeeded + jmin ((int) (storageNeeded / 2), 1024 * 1024) + 32) & ~31);
 
 		memcpy (static_cast<char*> (data.getData()) + position, buffer, howMany);
 		position += howMany;
@@ -10042,12 +10040,12 @@ const String MemoryOutputStream::toUTF8() const
 
 const String MemoryOutputStream::toString() const
 {
-	return String::createStringFromData (getData(), getDataSize());
+	return String::createStringFromData (getData(), (int) getDataSize());
 }
 
 OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const MemoryOutputStream& streamToRead)
 {
-	stream.write (streamToRead.getData(), streamToRead.getDataSize());
+	stream.write (streamToRead.getData(), (int) streamToRead.getDataSize());
 	return stream;
 }
 
diff --git a/src/io/files/juce_FileInputStream.cpp b/src/io/files/juce_FileInputStream.cpp
index 20508f32c0..2a9885b267 100644
--- a/src/io/files/juce_FileInputStream.cpp
+++ b/src/io/files/juce_FileInputStream.cpp
@@ -58,8 +58,6 @@ int64 FileInputStream::getTotalLength()
 
 int FileInputStream::read (void* buffer, int bytesToRead)
 {
-    int num = 0;
-
     if (needToSeek)
     {
         if (juce_fileSetPosition (fileHandle, currentPosition) < 0)
@@ -68,10 +66,10 @@ int FileInputStream::read (void* buffer, int bytesToRead)
         needToSeek = false;
     }
 
-    num = readInternal (buffer, bytesToRead);
+    const size_t num = readInternal (buffer, bytesToRead);
     currentPosition += num;
 
-    return num;
+    return (int) num;
 }
 
 bool FileInputStream::isExhausted()
diff --git a/src/io/network/juce_URL.cpp b/src/io/network/juce_URL.cpp
index fd6da778a4..d5363769f2 100644
--- a/src/io/network/juce_URL.cpp
+++ b/src/io/network/juce_URL.cpp
@@ -179,7 +179,7 @@ namespace URLHelpers
 
             // just a short text attachment, so use simple url encoding..
             headers << "Content-Type: application/x-www-form-urlencoded\r\nContent-length: "
-                    << postData.getSize() << "\r\n";
+                    << (unsigned int) postData.getSize() << "\r\n";
         }
     }
 }
diff --git a/src/io/streams/juce_MemoryOutputStream.cpp b/src/io/streams/juce_MemoryOutputStream.cpp
index 900f346a38..4553831c06 100644
--- a/src/io/streams/juce_MemoryOutputStream.cpp
+++ b/src/io/streams/juce_MemoryOutputStream.cpp
@@ -78,7 +78,7 @@ bool MemoryOutputStream::write (const void* const buffer, int howMany)
         const size_t storageNeeded = position + howMany;
 
         if (storageNeeded >= data.getSize())
-            data.ensureSize ((storageNeeded + jmin (storageNeeded / 2, (size_t) (1024 * 1024)) + 32) & ~31);
+            data.ensureSize ((storageNeeded + jmin ((int) (storageNeeded / 2), 1024 * 1024) + 32) & ~31);
 
         memcpy (static_cast<char*> (data.getData()) + position, buffer, howMany);
         position += howMany;
@@ -136,12 +136,12 @@ const String MemoryOutputStream::toUTF8() const
 
 const String MemoryOutputStream::toString() const
 {
-    return String::createStringFromData (getData(), getDataSize());
+    return String::createStringFromData (getData(), (int) getDataSize());
 }
 
 OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const MemoryOutputStream& streamToRead)
 {
-    stream.write (streamToRead.getData(), streamToRead.getDataSize());
+    stream.write (streamToRead.getData(), (int) streamToRead.getDataSize());
     return stream;
 }