diff --git a/include/osgParticle/ExplosionDebrisEffect b/include/osgParticle/ExplosionDebrisEffect
index 21c1f4b0b..521b84792 100644
--- a/include/osgParticle/ExplosionDebrisEffect
+++ b/include/osgParticle/ExplosionDebrisEffect
@@ -25,7 +25,7 @@ namespace osgParticle
     {
     public:
     
-        ExplosionDebrisEffect(bool automaticSetup=true);
+        explicit ExplosionDebrisEffect(bool automaticSetup=true);
 
         ExplosionDebrisEffect(const osg::Vec3& position, float scale=1.0f, float intensity=1.0f);
         
diff --git a/include/osgParticle/ExplosionEffect b/include/osgParticle/ExplosionEffect
index 89d55d380..39ce0838f 100644
--- a/include/osgParticle/ExplosionEffect
+++ b/include/osgParticle/ExplosionEffect
@@ -25,7 +25,7 @@ namespace osgParticle
     {
     public:
     
-        ExplosionEffect(bool automaticSetup=true);
+        explicit ExplosionEffect(bool automaticSetup=true);
 
         ExplosionEffect(const osg::Vec3& position, float scale=1.0f, float intensity=1.0f);
         
diff --git a/include/osgParticle/FireEffect b/include/osgParticle/FireEffect
index 504e43ff6..852eeb297 100644
--- a/include/osgParticle/FireEffect
+++ b/include/osgParticle/FireEffect
@@ -25,7 +25,7 @@ namespace osgParticle
     {
     public:
     
-        FireEffect(bool automaticSetup=true);
+        explicit FireEffect(bool automaticSetup=true);
     
         FireEffect(const osg::Vec3& position, float scale=1.0f, float intensity=1.0f);
         
diff --git a/include/osgParticle/ParticleEffect b/include/osgParticle/ParticleEffect
index 979572e75..a96ec45c0 100644
--- a/include/osgParticle/ParticleEffect
+++ b/include/osgParticle/ParticleEffect
@@ -24,7 +24,7 @@ namespace osgParticle
     {
     public:
     
-        ParticleEffect(bool automaticSetup=true):
+        explicit ParticleEffect(bool automaticSetup=true):
             _automaticSetup(automaticSetup),
             _useLocalParticleSystem(true),
             _scale(1.0f),
diff --git a/include/osgParticle/SmokeEffect b/include/osgParticle/SmokeEffect
index d7fe6f7d9..5a4ba23a2 100644
--- a/include/osgParticle/SmokeEffect
+++ b/include/osgParticle/SmokeEffect
@@ -25,7 +25,7 @@ namespace osgParticle
     {
     public:
     
-        SmokeEffect(bool automaticSetup=true);
+        explicit SmokeEffect(bool automaticSetup=true);
     
         SmokeEffect(const osg::Vec3& position, float scale=1.0f, float intensity=1.0f);
         
diff --git a/include/osgParticle/SmokeTrailEffect b/include/osgParticle/SmokeTrailEffect
index 377d2231f..a0f1e7034 100644
--- a/include/osgParticle/SmokeTrailEffect
+++ b/include/osgParticle/SmokeTrailEffect
@@ -25,7 +25,7 @@ namespace osgParticle
     {
     public:
     
-        SmokeTrailEffect(bool automaticSetup=true);
+        explicit SmokeTrailEffect(bool automaticSetup=true);
     
         SmokeTrailEffect(const osg::Vec3& position, float scale=1.0f, float intensity=1.0f);