diff --git a/dlib/test/blas_bindings/blas_bindings_dot.cpp b/dlib/test/blas_bindings/blas_bindings_dot.cpp
index 9f6aab940..0571b0685 100644
--- a/dlib/test/blas_bindings/blas_bindings_dot.cpp
+++ b/dlib/test/blas_bindings/blas_bindings_dot.cpp
@@ -146,10 +146,18 @@ namespace
             val = dot(rv,cv);
             DLIB_TEST(counter_dot() == 1);
 
+            counter_dot() = 0;
+            val = dot(rv,colm(cv,0));
+            DLIB_TEST(counter_dot() == 1);
+
             counter_dot() = 0;
             val = dot(cv,cv);
             DLIB_TEST(counter_dot() == 1);
 
+            counter_dot() = 0;
+            val = dot(colm(cv,0,cv.size()),colm(cv,0));
+            DLIB_TEST(counter_dot() == 1);
+
             counter_dot() = 0;
             val = dot(rv,rv);
             DLIB_TEST(counter_dot() == 1);