diff --git a/src/core/hle/service/hid/controllers/controller_base.h b/src/core/hle/service/hid/controllers/controller_base.h
index 47972f5fc2..8bc69c3726 100644
--- a/src/core/hle/service/hid/controllers/controller_base.h
+++ b/src/core/hle/service/hid/controllers/controller_base.h
@@ -18,7 +18,7 @@ class System;
 namespace Service::HID {
 class ControllerBase {
 public:
-    ControllerBase(Core::System& system);
+    explicit ControllerBase(Core::System& system);
     virtual ~ControllerBase();
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/gesture.h b/src/core/hle/service/hid/controllers/gesture.h
index b0f8794bab..3968975277 100644
--- a/src/core/hle/service/hid/controllers/gesture.h
+++ b/src/core/hle/service/hid/controllers/gesture.h
@@ -12,7 +12,7 @@
 namespace Service::HID {
 class Controller_Gesture final : public ControllerBase {
 public:
-    Controller_Gesture(Core::System& system);
+    explicit Controller_Gesture(Core::System& system);
     ~Controller_Gesture() override;
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/keyboard.h b/src/core/hle/service/hid/controllers/keyboard.h
index 37ff075b11..ef586f7eb8 100644
--- a/src/core/hle/service/hid/controllers/keyboard.h
+++ b/src/core/hle/service/hid/controllers/keyboard.h
@@ -15,7 +15,7 @@
 namespace Service::HID {
 class Controller_Keyboard final : public ControllerBase {
 public:
-    Controller_Keyboard(Core::System& system);
+    explicit Controller_Keyboard(Core::System& system);
     ~Controller_Keyboard() override;
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/mouse.h b/src/core/hle/service/hid/controllers/mouse.h
index 67e2647ad5..df2da6ae30 100644
--- a/src/core/hle/service/hid/controllers/mouse.h
+++ b/src/core/hle/service/hid/controllers/mouse.h
@@ -14,7 +14,7 @@
 namespace Service::HID {
 class Controller_Mouse final : public ControllerBase {
 public:
-    Controller_Mouse(Core::System& system);
+    explicit Controller_Mouse(Core::System& system);
     ~Controller_Mouse() override;
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/npad.h b/src/core/hle/service/hid/controllers/npad.h
index 3552c248ee..f72a9900ca 100644
--- a/src/core/hle/service/hid/controllers/npad.h
+++ b/src/core/hle/service/hid/controllers/npad.h
@@ -20,7 +20,7 @@ constexpr u32 NPAD_UNKNOWN = 16; // TODO(ogniK): What is this?
 
 class Controller_NPad final : public ControllerBase {
 public:
-    Controller_NPad(Core::System& system);
+    explicit Controller_NPad(Core::System& system);
     ~Controller_NPad() override;
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/stubbed.h b/src/core/hle/service/hid/controllers/stubbed.h
index 96dec4872f..37d7d85383 100644
--- a/src/core/hle/service/hid/controllers/stubbed.h
+++ b/src/core/hle/service/hid/controllers/stubbed.h
@@ -10,7 +10,7 @@
 namespace Service::HID {
 class Controller_Stubbed final : public ControllerBase {
 public:
-    Controller_Stubbed(Core::System& system);
+    explicit Controller_Stubbed(Core::System& system);
     ~Controller_Stubbed() override;
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/touchscreen.h b/src/core/hle/service/hid/controllers/touchscreen.h
index 2e8383b800..3429c84db3 100644
--- a/src/core/hle/service/hid/controllers/touchscreen.h
+++ b/src/core/hle/service/hid/controllers/touchscreen.h
@@ -14,7 +14,7 @@
 namespace Service::HID {
 class Controller_Touchscreen final : public ControllerBase {
 public:
-    Controller_Touchscreen(Core::System& system);
+    explicit Controller_Touchscreen(Core::System& system);
     ~Controller_Touchscreen() override;
 
     // Called when the controller is initialized
diff --git a/src/core/hle/service/hid/controllers/xpad.h b/src/core/hle/service/hid/controllers/xpad.h
index 813cb77555..c445ebec08 100644
--- a/src/core/hle/service/hid/controllers/xpad.h
+++ b/src/core/hle/service/hid/controllers/xpad.h
@@ -12,7 +12,7 @@
 namespace Service::HID {
 class Controller_XPad final : public ControllerBase {
 public:
-    Controller_XPad(Core::System& system);
+    explicit Controller_XPad(Core::System& system);
     ~Controller_XPad() override;
 
     // Called when the controller is initialized