libs3-64bit.diff

diff --git a/inc/request.h b/inc/request.h
index a80971a..1741f82 100644
--- a/inc/request.h
+++ b/inc/request.h
@@ -81,7 +81,7 @@ typedef struct RequestParams
     const S3GetConditions *getConditions;
 
     // Start byte
-    size_t startByte;
+    off_t startByte;
 
     // Byte count
     size_t byteCount;
diff --git a/src/request.c b/src/request.c
index dd66863..ea01c82 100644
--- a/src/request.c
+++ b/src/request.c
@@ -401,8 +401,9 @@ static S3Status compose_amz_headers(const RequestParams *params,
         // If byteCount != 0 then we're just copying a range, add header
         if (params->byteCount > 0) {
             char byteRange[S3_MAX_METADATA_SIZE];
-            snprintf(byteRange, sizeof(byteRange), "bytes=%zd-%zd",
-                     params->startByte, params->startByte + params->byteCount);
+            snprintf(byteRange, sizeof(byteRange), "bytes=%lld-%lld",
+                     (long long)params->startByte,
+                     (long long)params->startByte + params->byteCount);
             append_amz_header(values, 0, "x-amz-copy-source-range", byteRange);
         }
         // And the x-amz-metadata-directive header