diff --git a/plugins/spu2-x/src/Reverb.cpp b/plugins/spu2-x/src/Reverb.cpp
index e72a5b0eb8..0e985587d0 100644
--- a/plugins/spu2-x/src/Reverb.cpp
+++ b/plugins/spu2-x/src/Reverb.cpp
@@ -37,6 +37,7 @@ __forceinline s32 V_Core::RevbGetIndexer( s32 offset )
 		pos += EffectsStartA;
 	}
 
+	assert(pos >= EffectsStartA && pos <= EffectsEndA);
 	return pos;
 }