diff --git a/engine/joint/v4k.h b/engine/joint/v4k.h
index ec3c9e0..308a776 100644
--- a/engine/joint/v4k.h
+++ b/engine/joint/v4k.h
@@ -379457,7 +379457,7 @@ bool window_create_from_handle(void *handle, float scale, unsigned flags) {
     flags |= optioni("--vsync-adaptive", 0) || flag("--vsync-adaptive") ? WINDOW_VSYNC_ADAPTIVE : 0;
     int has_adaptive_vsync = glfwExtensionSupported("WGL_EXT_swap_control_tear") || glfwExtensionSupported("GLX_EXT_swap_control_tear") || glfwExtensionSupported("EXT_swap_control_tear");
     int wants_adaptive_vsync = (flags & WINDOW_VSYNC_ADAPTIVE);
-    int interval = has_adaptive_vsync && wants_adaptive_vsync ? -1 : (!(flags & WINDOW_VSYNC) ? 0 : 1);
+    int interval = has_adaptive_vsync && wants_adaptive_vsync ? -1 : (flags & WINDOW_VSYNC ? 1 : 0);
     glfwSwapInterval(interval);
 
     const GLFWvidmode *mode = glfwGetVideoMode(monitor ? monitor : glfwGetPrimaryMonitor());
diff --git a/engine/split/v4k_window.c b/engine/split/v4k_window.c
index f381b09..b8a44dd 100644
--- a/engine/split/v4k_window.c
+++ b/engine/split/v4k_window.c
@@ -378,7 +378,7 @@ bool window_create_from_handle(void *handle, float scale, unsigned flags) {
     flags |= optioni("--vsync-adaptive", 0) || flag("--vsync-adaptive") ? WINDOW_VSYNC_ADAPTIVE : 0;
     int has_adaptive_vsync = glfwExtensionSupported("WGL_EXT_swap_control_tear") || glfwExtensionSupported("GLX_EXT_swap_control_tear") || glfwExtensionSupported("EXT_swap_control_tear");
     int wants_adaptive_vsync = (flags & WINDOW_VSYNC_ADAPTIVE);
-    int interval = has_adaptive_vsync && wants_adaptive_vsync ? -1 : (!(flags & WINDOW_VSYNC) ? 0 : 1);
+    int interval = has_adaptive_vsync && wants_adaptive_vsync ? -1 : (flags & WINDOW_VSYNC ? 1 : 0);
     glfwSwapInterval(interval);
 
     const GLFWvidmode *mode = glfwGetVideoMode(monitor ? monitor : glfwGetPrimaryMonitor());
diff --git a/engine/v4k.c b/engine/v4k.c
index 351b38e..7e87a4a 100644
--- a/engine/v4k.c
+++ b/engine/v4k.c
@@ -26601,7 +26601,7 @@ bool window_create_from_handle(void *handle, float scale, unsigned flags) {
     flags |= optioni("--vsync-adaptive", 0) || flag("--vsync-adaptive") ? WINDOW_VSYNC_ADAPTIVE : 0;
     int has_adaptive_vsync = glfwExtensionSupported("WGL_EXT_swap_control_tear") || glfwExtensionSupported("GLX_EXT_swap_control_tear") || glfwExtensionSupported("EXT_swap_control_tear");
     int wants_adaptive_vsync = (flags & WINDOW_VSYNC_ADAPTIVE);
-    int interval = has_adaptive_vsync && wants_adaptive_vsync ? -1 : (!(flags & WINDOW_VSYNC) ? 0 : 1);
+    int interval = has_adaptive_vsync && wants_adaptive_vsync ? -1 : (flags & WINDOW_VSYNC ? 1 : 0);
     glfwSwapInterval(interval);
 
     const GLFWvidmode *mode = glfwGetVideoMode(monitor ? monitor : glfwGetPrimaryMonitor());