diff --git a/tools/binman/control.py b/tools/binman/control.py
index 304fc70..7da69ba 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -355,6 +355,7 @@
     Returns:
         List of EntryInfo records that were written
     """
+    image_fname = os.path.abspath(image_fname)
     image = Image.FromFile(image_fname)
 
     # Replace an entry from a single file, as a special case