diff --git a/src/window/input.cpp b/src/window/input.cpp
index d84bc618..56c19cfd 100644
--- a/src/window/input.cpp
+++ b/src/window/input.cpp
@@ -239,6 +239,13 @@ const Binding& Bindings::require(const std::string& name) const {
     throw std::runtime_error("binding '" + name + "' does not exist");
 }
 
+Binding& Bindings::require(const std::string& name) {
+    if (const auto found = get(name)) {
+        return *found;
+    }
+    throw std::runtime_error("binding '" + name + "' does not exist");
+}
+
 void Bindings::read(const dv::value& map, BindType bindType) {
     for (auto& [sectionName, section] : map.asObject()) {
         for (auto& [name, value] : section.asObject()) {
diff --git a/src/window/input.hpp b/src/window/input.hpp
index ba858770..0c1ea008 100644
--- a/src/window/input.hpp
+++ b/src/window/input.hpp
@@ -204,7 +204,11 @@ public:
     }
 
     Binding* get(const std::string& name) {
-        return const_cast<Bindings*>(this)->get(name);
+        const auto found = bindings.find(name);
+        if (found == bindings.end()) {
+            return nullptr;
+        }
+        return &found->second;
     }
 
     const Binding* get(const std::string& name) const {
@@ -215,9 +219,7 @@ public:
         return &found->second;
     }
 
-    Binding& require(const std::string& name) {
-        return const_cast<Bindings*>(this)->require(name);
-    }
+    Binding& require(const std::string& name);
 
     const Binding& require(const std::string& name) const;