diff --git a/include/GLFW/glfw3.h b/include/GLFW/glfw3.h
index 5d0ce46ea..b8777d47b 100644
--- a/include/GLFW/glfw3.h
+++ b/include/GLFW/glfw3.h
@@ -1594,7 +1594,7 @@ GLFWAPI int glfwInit(void);
  *
  *	@ingroup init
 */
-GLFWAPI GLFWbool glfwIsInit(void);
+GLFWAPI int glfwIsInit(void);
 
 /*! @brief Terminates the GLFW library.
  *
diff --git a/src/init.c b/src/init.c
index dbe69884e..5a066306a 100644
--- a/src/init.c
+++ b/src/init.c
@@ -220,7 +220,7 @@ GLFWAPI int glfwInit(void)
     return GLFW_TRUE;
 }
 
-GLFWAPI GLFWbool glfwIsInit(void)
+GLFWAPI int glfwIsInit(void)
 {
 	return _glfw.initialized;
 }