diff --git a/panda/src/testbed/test_sprite_particles.cxx b/panda/src/testbed/test_sprite_particles.cxx
index 78d09736a1..6a9043d694 100644
--- a/panda/src/testbed/test_sprite_particles.cxx
+++ b/panda/src/testbed/test_sprite_particles.cxx
@@ -76,6 +76,13 @@
 // particle factory params
 #define PARTICLE_FACTORY_LIFESPAN_BASE   0.5f
 
+#define SPRITE_PARTICLE_RENDERER_ALPHA_DISABLE      false
+#define PARTICLE_RENDERER_ALPHA_MODE  BaseParticleRenderer::PR_ALPHA_NONE
+//#define PARTICLE_RENDERER_ALPHA_MODE  BaseParticleRenderer::PR_ALPHA_IN
+//#define PARTICLE_RENDERER_ALPHA_MODE  BaseParticleRenderer::PR_ALPHA_OUT
+//#define PARTICLE_RENDERER_ALPHA_MODE  BaseParticleRenderer::PR_ALPHA_USER
+//#define PARTICLE_RENDERER_USER_ALPHA  1.0
+
 #if defined POINT_PARTICLE_RENDERER
   #define POINT_PARTICLE_RENDERER_POINT_SIZE    1.0f
 #elif defined SPRITE_PARTICLE_RENDERER
@@ -89,9 +96,9 @@
 //  #define SPRITE_PARTICLE_RENDERER_INITIAL_Y_SCALE    0.0
 //  #define SPRITE_PARTICLE_RENDERER_FINAL_Y_SCALE      0.5
   #define SPRITE_PARTICLE_RENDERER_NONANIMATED_THETA  45.0f
-  #define SPRITE_PARTICLE_RENDERER_BLEND_METHOD       PP_BLEND_LINEAR
-//  #define SPRITE_PARTICLE_RENDERER_BLEND_METHOD       PP_BLEND_CUBIC
-//  #define SPRITE_PARTICLE_RENDERER_ALPHA_DISABLE      false
+  #define SPRITE_PARTICLE_RENDERER_BLEND_METHOD        BaseParticleRenderer::PP_BLEND_LINEAR
+//  #define SPRITE_PARTICLE_RENDERER_BLEND_METHOD      BaseParticleRenderer::PP_BLEND_CUBIC
+//  #define SPRITE_PARTICLE_RENDERER_ALPHA_DISABLE     false
 #endif
 
 // particle emitter params