diff --git a/source/sw/src/game.cpp b/source/sw/src/game.cpp
index 20d3f3a40..5468b1f2c 100644
--- a/source/sw/src/game.cpp
+++ b/source/sw/src/game.cpp
@@ -2921,7 +2921,7 @@ _Assert(const char *expr, const char *strFile, unsigned uLine)
     MONO_PRINT(ds);
     TerminateGame();
 #if 1 //def RENDERTYPEWIN
-    wm_msgbox(apptitle, ds);
+    wm_msgbox(apptitle, "%s", ds);
 #else
     printf("Assertion failed: %s\n %s, line %u\n", expr, strFile, uLine);
 #endif
@@ -2946,7 +2946,7 @@ _ErrMsg(const char *strFile, unsigned uLine, const char *format, ...)
         va_start(arglist, format);
         Bvsnprintf(msg, sizeof(msg) - (p-msg), format, arglist);
         va_end(arglist);
-        wm_msgbox(apptitle, msg);
+        wm_msgbox(apptitle, "%s", msg);
     }
 #else
     printf("Error: %s, line %u\n", strFile, uLine);
@@ -4903,7 +4903,7 @@ void GetConInput(PLAYERp pp)
                 KB_ClearKeysDown();
                 KB_FlushKeyboardQueue();
                 CONTROL_ClearButton(gamefunc_Inventory);
-                CON_ConMessage(MessageInputString);
+                CON_ConMessage("%s", MessageInputString);
                 CON_ProcessUserCommand();     // Check to see if it's a cheat or command
 
                 conbot += 6;
diff --git a/source/sw/src/jnstub.cpp b/source/sw/src/jnstub.cpp
index 01aec9d5f..dd24b7236 100644
--- a/source/sw/src/jnstub.cpp
+++ b/source/sw/src/jnstub.cpp
@@ -1431,7 +1431,7 @@ static void sw_printmessage256(const char *text)
 static void sw_printmessage16(const char *text)
 {
     lastpm16time = totalclock;
-    _printmessage16(text);
+    _printmessage16("%s", text);
 }
 
 void
@@ -3582,10 +3582,7 @@ ShowNextTag(void)
         return;
 
     printmessage16(" ");
-
-    sprintf(tempbuf, "Next tag = %d", siNextEndTag);
-    printmessage16(tempbuf);
-
+    printmessage16("Next tag = %d", siNextEndTag);
 }
 
 void
diff --git a/source/sw/src/sounds.cpp b/source/sw/src/sounds.cpp
index 9a5e2b4c9..a3959c4be 100644
--- a/source/sw/src/sounds.cpp
+++ b/source/sw/src/sounds.cpp
@@ -753,7 +753,7 @@ SWBOOL CacheSound(int num, int type)
         if (!OpenSound(vp, &handle, &length))
         {
             sprintf(ds,"Could not open sound %s, num %d, priority %d\n",vp->name,num,vp->priority);
-            CON_ConMessage(ds);
+            CON_ConMessage("%s", ds);
             return FALSE;
         }
 
diff --git a/source/sw/src/sprite.cpp b/source/sw/src/sprite.cpp
index e1a807fd1..6e409b860 100644
--- a/source/sw/src/sprite.cpp
+++ b/source/sw/src/sprite.cpp
@@ -5789,7 +5789,7 @@ KeyMain:
                         sprintf(ds,"Fortune Say: %s\n",ReadFortune[STD_RANDOM_RANGE(10)]);
                     else
                         sprintf(ds,"Fortune Say: %s\n",ReadFortune[STD_RANDOM_RANGE(MAX_FORTUNES)]);
-                    CON_Message(ds);
+                    CON_Message("%s", ds);
                 }
 
                 SetFadeAmt(pp,ITEMFLASHAMT,ITEMFLASHCLR);  // Flash blue on item pickup
diff --git a/source/sw/src/text.cpp b/source/sw/src/text.cpp
index 9d5faaf10..86a3a4b4e 100644
--- a/source/sw/src/text.cpp
+++ b/source/sw/src/text.cpp
@@ -461,7 +461,7 @@ void PutStringInfo(PLAYERp pp, const char *string)
     if (!gs.Messages)
         return;
 
-    CON_ConMessage(string); // Put it in the console too
+    CON_ConMessage("%s", string); // Put it in the console too
     PutStringInfoLine(pp, string);
 }