diff --git a/CHANGES b/CHANGES
index 83eeba724..5e7dd6f05 100644
--- a/CHANGES
+++ b/CHANGES
@@ -65,6 +65,7 @@ Emulation fixes:
  - GBA Video: Emulate sprite cycle limits in OpenGL renderer (fixes mgba.io/i/1635)
  - GBA Video: Fix OBJWIN erratic rendering in OpenGL renderer
  - GBA Video: Fix x offset in 256-color BG mosaic (fixes mgba.io/i/1684)
+ - GBA Video: Fix transposed BG mosaic parameters in GL renderer
  - SM83: Emulate HALT bug
  - SM83: Improve mid-M-cycle interrupts
  - SM83: HALT should not consume an extra T-state
diff --git a/src/gba/renderers/gl.c b/src/gba/renderers/gl.c
index 283d602f0..49653a268 100644
--- a/src/gba/renderers/gl.c
+++ b/src/gba/renderers/gl.c
@@ -1818,7 +1818,7 @@ void _prepareBackground(struct GBAVideoGLRenderer* renderer, struct GBAVideoGLBa
 	glUniform1i(uniforms[GBA_GL_BG_VRAM], 0);
 	glUniform1i(uniforms[GBA_GL_OBJ_PALETTE], 1);
 	if (background->mosaic) {
-		glUniform2i(uniforms[GBA_GL_BG_MOSAIC], GBAMosaicControlGetBgV(renderer->mosaic) + 1, GBAMosaicControlGetBgH(renderer->mosaic) + 1);
+		glUniform2i(uniforms[GBA_GL_BG_MOSAIC], GBAMosaicControlGetBgH(renderer->mosaic) + 1, GBAMosaicControlGetBgV(renderer->mosaic) + 1);
 	} else {
 		glUniform2i(uniforms[GBA_GL_BG_MOSAIC], 0, 0);
 	}