diff --git a/docs/vulkan.dox b/docs/vulkan.dox
index 97099f87..a5400032 100644
--- a/docs/vulkan.dox
+++ b/docs/vulkan.dox
@@ -127,7 +127,7 @@ To query the instance extensions required, call @ref
 glfwGetRequiredInstanceExtensions.
 
 @code
-int count;
+unsigned int count;
 const char** extensions = glfwGetRequiredInstanceExtensions(&count);
 @endcode
 
diff --git a/include/GLFW/glfw3.h b/include/GLFW/glfw3.h
index 78346714..55c891ec 100644
--- a/include/GLFW/glfw3.h
+++ b/include/GLFW/glfw3.h
@@ -3785,7 +3785,7 @@ GLFWAPI int glfwVulkanSupported(void);
  *
  *  @ingroup vulkan
  */
-GLFWAPI const char** glfwGetRequiredInstanceExtensions(int* count);
+GLFWAPI const char** glfwGetRequiredInstanceExtensions(unsigned int* count);
 
 #if defined(VK_VERSION_1_0)
 
diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index a3243750..093d2b0a 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -1339,7 +1339,7 @@ const char* _glfwPlatformGetClipboardString(_GLFWwindow* window)
     return _glfw.ns.clipboardString;
 }
 
-char** _glfwPlatformGetRequiredInstanceExtensions(int* count)
+char** _glfwPlatformGetRequiredInstanceExtensions(unsigned int* count)
 {
     *count = 0;
     return NULL;
diff --git a/src/internal.h b/src/internal.h
index 3d8edc88..358da256 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -438,7 +438,7 @@ struct _GLFWlibrary
         GLFWbool        available;
         void*           handle;
         char**          extensions;
-        int             extensionCount;
+        unsigned int    extensionCount;
         PFN_vkEnumerateInstanceExtensionProperties EnumerateInstanceExtensionProperties;
         PFN_vkGetInstanceProcAddr GetInstanceProcAddr;
         GLFWbool        KHR_surface;
@@ -784,7 +784,7 @@ void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor);
 
 /*! @ingroup platform
  */
-char** _glfwPlatformGetRequiredInstanceExtensions(int* count);
+char** _glfwPlatformGetRequiredInstanceExtensions(unsigned int* count);
 
 /*! @ingroup platform
  */
diff --git a/src/mir_window.c b/src/mir_window.c
index 6e0ee16b..0642d08d 100644
--- a/src/mir_window.c
+++ b/src/mir_window.c
@@ -719,7 +719,7 @@ const char* _glfwPlatformGetClipboardString(_GLFWwindow* window)
     return NULL;
 }
 
-char** _glfwPlatformGetRequiredInstanceExtensions(int* count)
+char** _glfwPlatformGetRequiredInstanceExtensions(unsigned int* count)
 {
     char** extensions;
 
diff --git a/src/vulkan.c b/src/vulkan.c
index 04db23e0..504ed636 100644
--- a/src/vulkan.c
+++ b/src/vulkan.c
@@ -196,7 +196,7 @@ GLFWAPI int glfwVulkanSupported(void)
     return _glfw.vk.available;
 }
 
-GLFWAPI const char** glfwGetRequiredInstanceExtensions(int* count)
+GLFWAPI const char** glfwGetRequiredInstanceExtensions(unsigned int* count)
 {
     *count = 0;
 
diff --git a/src/win32_window.c b/src/win32_window.c
index 55d98b9a..b2c627d2 100644
--- a/src/win32_window.c
+++ b/src/win32_window.c
@@ -1418,7 +1418,7 @@ const char* _glfwPlatformGetClipboardString(_GLFWwindow* window)
     return _glfw.win32.clipboardString;
 }
 
-char** _glfwPlatformGetRequiredInstanceExtensions(int* count)
+char** _glfwPlatformGetRequiredInstanceExtensions(unsigned int* count)
 {
     char** extensions;
 
diff --git a/src/wl_window.c b/src/wl_window.c
index c3303d70..706f52a3 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -710,7 +710,7 @@ const char* _glfwPlatformGetClipboardString(_GLFWwindow* window)
     return NULL;
 }
 
-char** _glfwPlatformGetRequiredInstanceExtensions(int* count)
+char** _glfwPlatformGetRequiredInstanceExtensions(unsigned int* count)
 {
     char** extensions;
 
diff --git a/src/x11_window.c b/src/x11_window.c
index ddfc9159..2f9130a7 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -2127,7 +2127,7 @@ const char* _glfwPlatformGetClipboardString(_GLFWwindow* window)
     return _glfw.x11.clipboardString;
 }
 
-char** _glfwPlatformGetRequiredInstanceExtensions(int* count)
+char** _glfwPlatformGetRequiredInstanceExtensions(unsigned int* count)
 {
     char** extensions;
 
diff --git a/tests/glfwinfo.c b/tests/glfwinfo.c
index 002a9bc4..d74b49fd 100644
--- a/tests/glfwinfo.c
+++ b/tests/glfwinfo.c
@@ -798,7 +798,7 @@ int main(int argc, char** argv)
         PFN_vkEnumeratePhysicalDevices vkEnumeratePhysicalDevices;
         PFN_vkGetPhysicalDeviceProperties vkGetPhysicalDeviceProperties;
 
-        re = glfwGetRequiredInstanceExtensions((int*) &re_count);
+        re = glfwGetRequiredInstanceExtensions(&re_count);
 
         printf("Vulkan required instance extensions:");
         for (i = 0;  i < re_count;  i++)
diff --git a/tests/vulkan.c b/tests/vulkan.c
index 21dd0137..dfc51710 100644
--- a/tests/vulkan.c
+++ b/tests/vulkan.c
@@ -1732,7 +1732,7 @@ static void demo_init_vk(struct demo *demo) {
     }
 
     /* Look for instance extensions */
-    required_extensions = glfwGetRequiredInstanceExtensions((int*) &required_extension_count);
+    required_extensions = glfwGetRequiredInstanceExtensions(&required_extension_count);
     if (!required_extensions) {
         ERR_EXIT("glfwGetRequiredInstanceExtensions failed to find the "
                  "platform surface extensions.\n\nDo you have a compatible "