diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index 7f7c8bf1..98029041 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -1169,6 +1169,8 @@ void _glfwSetWindowTaskbarProgressCocoa(_GLFWwindow* window, int progressState,
 
 void _glfwSetWindowTaskbarBadgeCocoa(_GLFWwindow* window, int count)
 {
+    _glfwInputError(GLFW_FEATURE_UNIMPLEMENTED,
+                    "Cocoa: Setting the taskbar progress badge is not implemented");
 }
 
 void _glfwGetWindowPosCocoa(_GLFWwindow* window, int* xpos, int* ypos)
diff --git a/src/wl_window.c b/src/wl_window.c
index 2917e226..b91fd8f5 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -1913,6 +1913,8 @@ void _glfwSetWindowTaskbarProgressWayland(_GLFWwindow* window, const int progres
 
 void _glfwSetWindowTaskbarBadgeWayland(_GLFWwindow* window, int count)
 {
+    _glfwInputError(GLFW_FEATURE_UNIMPLEMENTED,
+                    "Wayland: Setting the taskbar progress badge is not implemented");
 }
 
 void _glfwGetWindowPosWayland(_GLFWwindow* window, int* xpos, int* ypos)
diff --git a/src/x11_window.c b/src/x11_window.c
index d7001b56..99e8a974 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -2161,8 +2161,10 @@ void _glfwSetWindowTaskbarProgressX11(_GLFWwindow* window, int progressState, do
     _glfwUpdateTaskbarProgressDBusPOSIX(progressVisible, value);
 }
 
-void _glfwSetWindowTaskbarProgressX11(_GLFWwindow* window, int count)
+void _glfwSetWindowTaskbarBadgeX11(_GLFWwindow* window, int count)
 {
+    _glfwInputError(GLFW_FEATURE_UNIMPLEMENTED,
+                    "X11: Setting the taskbar progress badge is not implemented");
 }
 
 void _glfwGetWindowPosX11(_GLFWwindow* window, int* xpos, int* ypos)