diff --git a/Classes/S3/ASIS3Request.h b/Classes/S3/ASIS3Request.h
index 913aef9d..37e443fa 100644
--- a/Classes/S3/ASIS3Request.h
+++ b/Classes/S3/ASIS3Request.h
@@ -52,6 +52,9 @@ typedef enum _ASIS3ErrorType {
 
 	// The access policy to use when PUTting a file (see the string constants at the top ASIS3Request.h for details on what the possible options are)
 	NSString *accessPolicy;
+    
+    // The session token used by Temporary Security Credentials
+    NSString *sessionToken;
 
 	// Internally used while parsing errors
 	NSString *currentXMLElementContent;
@@ -106,4 +109,5 @@ typedef enum _ASIS3ErrorType {
 @property (retain) NSString *currentXMLElementContent;
 @property (retain) NSMutableArray *currentXMLElementStack;
 @property (retain) NSString *requestScheme;
+@property (retain) NSString *sessionToken;
 @end
diff --git a/Classes/S3/ASIS3Request.m b/Classes/S3/ASIS3Request.m
index d07000c9..a439b1f9 100644
--- a/Classes/S3/ASIS3Request.m
+++ b/Classes/S3/ASIS3Request.m
@@ -48,6 +48,7 @@ - (void)dealloc
 	[secretAccessKey release];
 	[accessPolicy release];
 	[requestScheme release];
+    [sessionToken release];
 	[super dealloc];
 }
 
@@ -71,6 +72,9 @@ - (NSMutableDictionary *)S3Headers
 	if ([self accessPolicy]) {
 		[headers setObject:[self accessPolicy] forKey:@"x-amz-acl"];
 	}
+    if (self.sessionToken) {
+        [headers setObject:[self sessionToken] forKey:@"x-amz-security-token"];
+    }
 	return headers;
 }
 
@@ -309,4 +313,5 @@ - (void)buildURL
 @synthesize currentXMLElementStack;
 @synthesize accessPolicy;
 @synthesize requestScheme;
+@synthesize sessionToken;
 @end