diff --git a/engine/common/particles.h b/engine/common/particles.h
index 0678631e9..8c9e4c64b 100644
--- a/engine/common/particles.h
+++ b/engine/common/particles.h
@@ -57,6 +57,7 @@ typedef struct particle_s
 
 // drivers never touch the following fields
 	vec3_t		vel;
+	float		rotationspeed;
 	struct particle_s	*next;
 	float		nextemit;
 	float		die;