diff --git a/internal/graphics/opengl/context_desktop.go b/internal/graphics/opengl/context_desktop.go
index 2037c10c4..a7421c84f 100644
--- a/internal/graphics/opengl/context_desktop.go
+++ b/internal/graphics/opengl/context_desktop.go
@@ -254,6 +254,8 @@ func (c *Context) DeleteFramebuffer(f Framebuffer) {
 		// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
 		if c.lastFramebuffer == f {
 			c.lastFramebuffer = ZeroFramebuffer
+			c.lastViewportWidth = 0
+			c.lastViewportHeight = 0
 		}
 		gl.DeleteFramebuffers(1, &ff)
 		return nil
diff --git a/internal/graphics/opengl/context_js.go b/internal/graphics/opengl/context_js.go
index 8576d9f94..b6627d1f2 100644
--- a/internal/graphics/opengl/context_js.go
+++ b/internal/graphics/opengl/context_js.go
@@ -230,6 +230,8 @@ func (c *Context) DeleteFramebuffer(f Framebuffer) {
 	// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
 	if c.lastFramebuffer == f {
 		c.lastFramebuffer = ZeroFramebuffer
+		c.lastViewportWidth = 0
+		c.lastViewportHeight = 0
 	}
 	gl.DeleteFramebuffer(f.Object)
 }