diff --git a/contrib/seekable_format/examples/seekable_decompression.c b/contrib/seekable_format/examples/seekable_decompression.c
index 9cd232922..7050e0fa5 100644
--- a/contrib/seekable_format/examples/seekable_decompression.c
+++ b/contrib/seekable_format/examples/seekable_decompression.c
@@ -84,7 +84,7 @@ static void fseek_orDie(FILE* file, long int offset, int origin) {
 }
 
 
-static void decompressFile_orDie(const char* fname, unsigned startOffset, unsigned endOffset)
+static void decompressFile_orDie(const char* fname, off_t startOffset, off_t endOffset)
 {
     FILE* const fin  = fopen_orDie(fname, "rb");
     FILE* const fout = stdout;
@@ -129,8 +129,8 @@ int main(int argc, const char** argv)
 
     {
         const char* const inFilename = argv[1];
-        unsigned const startOffset = (unsigned) atoi(argv[2]);
-        unsigned const endOffset = (unsigned) atoi(argv[3]);
+        off_t const startOffset = atoll(argv[2]);
+        off_t const endOffset = atoll(argv[3]);
         decompressFile_orDie(inFilename, startOffset, endOffset);
     }
 
diff --git a/contrib/seekable_format/zstdseek_decompress.c b/contrib/seekable_format/zstdseek_decompress.c
index 2b109b9d0..b4c48754e 100644
--- a/contrib/seekable_format/zstdseek_decompress.c
+++ b/contrib/seekable_format/zstdseek_decompress.c
@@ -313,8 +313,8 @@ static size_t ZSTD_seekable_loadSeekTable(ZSTD_seekable* zs)
             /* compute cumulative positions */
             for (; idx < numFrames; idx++) {
                 if (pos + sizePerEntry > SEEKABLE_BUFF_SIZE) {
-                    U32 const toRead = MIN(remaining, SEEKABLE_BUFF_SIZE);
                     U32 const offset = SEEKABLE_BUFF_SIZE - pos;
+                    U32 const toRead = MIN(remaining, SEEKABLE_BUFF_SIZE - offset);
                     memmove(zs->inBuff, zs->inBuff + pos, offset); /* move any data we haven't read yet */
                     CHECK_IO(src.read(src.opaque, zs->inBuff+offset, toRead));
                     remaining -= toRead;