diff --git a/src/devices/sound/vgm_visualizer.cpp b/src/devices/sound/vgm_visualizer.cpp
index a44a9f3bcf6..cc8041f6d36 100644
--- a/src/devices/sound/vgm_visualizer.cpp
+++ b/src/devices/sound/vgm_visualizer.cpp
@@ -17,6 +17,8 @@
 
 #include <cmath>
 
+constexpr int vgmviz_device::SCREEN_HEIGHT;
+
 constexpr float lerp(float a, float b, float f)
 {
 	return (b - a) * f + a;