diff --git a/src/dassert.m b/src/dassert.m
index a58ab3d2dc42200f17e5d2f550615a47faaf6430..e958a65be161432a24af9beba776dffae7de8292 100644
--- a/src/dassert.m
+++ b/src/dassert.m
@@ -61,6 +61,8 @@ if isa(A,'double')
             t = 1;
         end
     end
+elseif isa(A,'char')
+    t = isequal(A, B);
 elseif isa(A,'cell')
     rA = reshape(A, prod(sA), 1);
     rB = reshape(B, prod(sB), 1);