diff --git a/apps/openmw/mwmechanics/spellcasting.cpp b/apps/openmw/mwmechanics/spellcasting.cpp
index 1b2fbfdc8..cb4e04fa1 100644
--- a/apps/openmw/mwmechanics/spellcasting.cpp
+++ b/apps/openmw/mwmechanics/spellcasting.cpp
@@ -2,7 +2,7 @@
 
 #include <cfloat>
 #include <limits>
-#include <stdio.h>
+#include <iomanip>
 
 #include <boost/format.hpp>
 
@@ -339,13 +339,11 @@ namespace MWMechanics
         
         if (projectileEffects.mList.size() > 1) // add a VFX_Multiple projectile if there are multiple projectile effects
         {
+            std::ostringstream ID;
+            ID << "VFX_Multiple" << projectileEffects.mList.size();
             std::vector<std::string>::iterator it;
             it = projectileIDs.begin();
-            char numstr[8];
-            sprintf(numstr, "%d", (int)(effects.mList.size()));
-            std::string ID = "VFX_Multiple";
-            ID = ID + numstr;
-            it = projectileIDs.insert(it, ID);
+            it = projectileIDs.insert(it, ID.str());
         }
 
         // Fall back to a "caster to target" direction if we have no other means of determining it
diff --git a/apps/openmw/mwworld/projectilemanager.cpp b/apps/openmw/mwworld/projectilemanager.cpp
index a7b4be9c9..ec4ee6941 100644
--- a/apps/openmw/mwworld/projectilemanager.cpp
+++ b/apps/openmw/mwworld/projectilemanager.cpp
@@ -1,6 +1,6 @@
 #include "projectilemanager.hpp"
 
-#include <stdio.h>
+#include <iomanip>
 
 #include <osg/PositionAttitudeTransform>
 
@@ -99,10 +99,8 @@ namespace MWWorld
         if (state.mIdMagic.size() > 1)
             for (size_t iter = 1; iter != state.mIdMagic.size(); ++iter)
             {
-                char numstr[8];
-                sprintf(numstr, "%d", (int)iter);
-                std::string node = "Dummy0";
-                node = node + numstr;
+                std::ostringstream nodeName;
+                nodeName << "Dummy" << std::setw(2) << std::setfill('0') << iter;
                 const ESM::Weapon* weapon = MWBase::Environment::get().getWorld()->getStore().get<ESM::Weapon>().find (state.mIdMagic.at(iter));
                 mResourceSystem->getSceneManager()->getInstance("meshes\\" + weapon->mModel, attachTo);
             }