diff --git a/cellular.cc b/cellular.cc
index 2c56b9d..f1d7a45 100644
--- a/cellular.cc
+++ b/cellular.cc
@@ -372,7 +372,7 @@
   // TODO(petkov): Set old_url/usage_url.
 }
 
-bool Cellular::TechnologyIs(const Device::Technology type) {
+bool Cellular::TechnologyIs(const Device::Technology type) const {
   return type == Device::kCellular;
 }