diff --git a/camelot/ocr.py b/camelot/ocr.py
index ea2de2e..7aa2948 100644
--- a/camelot/ocr.py
+++ b/camelot/ocr.py
@@ -260,7 +260,7 @@ class OCRStream:
             if self.columns is not None:
                 if len(self.table_area) != len(self.columns):
                     raise ValueError("{0}: Length of table area and columns"
-                                     "should be equal.".format(os.path.basename(bname)))
+                                     " should be equal.".format(os.path.basename(bname)))
 
             table_bbox = {}
             for area in self.table_area:
diff --git a/camelot/stream.py b/camelot/stream.py
index 2b6948a..e794d6a 100644
--- a/camelot/stream.py
+++ b/camelot/stream.py
@@ -313,7 +313,7 @@ class Stream:
             if self.columns is not None:
                 if len(self.table_area) != len(self.columns):
                     raise ValueError("{0}: Length of table area and columns"
-                                     "should be equal.".format(os.path.basename(bname)))
+                                     " should be equal.".format(os.path.basename(bname)))
 
             table_bbox = {}
             for area in self.table_area: