diff --git a/plugins/sources/spreadsheet.inc b/plugins/sources/spreadsheet.inc
index c3ba3b1..1c00955 100644
--- a/plugins/sources/spreadsheet.inc
+++ b/plugins/sources/spreadsheet.inc
@@ -203,7 +203,7 @@ class MigrateSourceSpreadsheet extends MigrateSource {
    */
   public function computeCount() {
     // Subtract the non-data rows (rows before header and the header).
-    return $this->rows - $this->headerRows + 1;
+    return $this->rows - $this->headerRows - 1;
   }
 
   /**