diff --git a/panda/src/particlesystem/Sources.pp b/panda/src/particlesystem/Sources.pp
index 0dcf9816a2..f18230c0c3 100644
--- a/panda/src/particlesystem/Sources.pp
+++ b/panda/src/particlesystem/Sources.pp
@@ -12,7 +12,8 @@
      baseParticle.I baseParticle.h baseParticleEmitter.I  \
      baseParticleEmitter.h baseParticleFactory.I  \
      baseParticleFactory.h baseParticleRenderer.I  \
-     baseParticleRenderer.h boxEmitter.I boxEmitter.h  \
+     baseParticleRenderer.h arcEmitter.I arcEmitter.h \
+     boxEmitter.I boxEmitter.h  \
      config_particlesystem.h discEmitter.I discEmitter.h  \
      geomParticleRenderer.I geomParticleRenderer.h lineEmitter.I  \
      lineEmitter.h lineParticleRenderer.I lineParticleRenderer.h  \
@@ -37,7 +38,7 @@
     
  #define INCLUDED_SOURCES \
      baseParticle.cxx baseParticleEmitter.cxx baseParticleFactory.cxx \
-     baseParticleRenderer.cxx boxEmitter.cxx \
+     baseParticleRenderer.cxx boxEmitter.cxx arcEmitter.cxx \
      config_particlesystem.cxx discEmitter.cxx \
      geomParticleRenderer.cxx lineEmitter.cxx \
      lineParticleRenderer.cxx particleSystem.cxx \
@@ -54,8 +55,9 @@
   #define INSTALL_HEADERS \
     baseParticle.I baseParticle.h baseParticleEmitter.I \
     baseParticleEmitter.h baseParticleFactory.I baseParticleFactory.h \
-    baseParticleRenderer.I baseParticleRenderer.h boxEmitter.I \
-    boxEmitter.h config_particlesystem.h discEmitter.I discEmitter.h \
+    baseParticleRenderer.I baseParticleRenderer.h arcEmitter.I arcEmitter.h \
+    boxEmitter.I boxEmitter.h config_particlesystem.h \
+    discEmitter.I discEmitter.h \
     emitters.h geomParticleRenderer.I geomParticleRenderer.h \
     lineEmitter.I lineEmitter.h lineParticleRenderer.I \
     lineParticleRenderer.h particleSystem.I particleSystem.h \
diff --git a/panda/src/particlesystem/particlesystem_composite2.cxx b/panda/src/particlesystem/particlesystem_composite2.cxx
index ef2f01480c..09f04eb3ac 100644
--- a/panda/src/particlesystem/particlesystem_composite2.cxx
+++ b/panda/src/particlesystem/particlesystem_composite2.cxx
@@ -3,6 +3,7 @@
 #include "baseParticleEmitter.cxx"
 #include "baseParticleFactory.cxx"
 #include "baseParticleRenderer.cxx"
+#include "arcEmitter.cxx"
 #include "boxEmitter.cxx"
 #include "discEmitter.cxx"
 #include "lineEmitter.cxx"
diff --git a/panda/src/particlesystem/ringEmitter.h b/panda/src/particlesystem/ringEmitter.h
index c8d79b2253..9e59f2c21f 100644
--- a/panda/src/particlesystem/ringEmitter.h
+++ b/panda/src/particlesystem/ringEmitter.h
@@ -45,7 +45,7 @@ PUBLISHED:
   virtual void output(ostream &out) const;
   virtual void write(ostream &out, int indent=0) const;
 
-private:
+protected:
   float _radius;
   float _radius_spread;
 
@@ -58,6 +58,7 @@ private:
   float _cos_theta;
   ///////////////////////////////
 
+private:
   virtual void assign_initial_position(LPoint3f& pos);
   virtual void assign_initial_velocity(LVector3f& vel);
 };