diff --git a/src/ui/CSimpleFontStringScript.cpp b/src/ui/CSimpleFontStringScript.cpp
index ee90d77..f7b5594 100644
--- a/src/ui/CSimpleFontStringScript.cpp
+++ b/src/ui/CSimpleFontStringScript.cpp
@@ -139,8 +139,8 @@ int32_t CSimpleFontString_SetFormattedText(lua_State* L) {
         luaL_error(L, "%s:SetFormattedText(): Font not set", string->GetDisplayName());
     }
 
-    char buffer[4096] = {};
-    char* text = FrameScript_Sprintf(L, 2, buffer, sizeof(buffer));
+    char buffer[4096];
+    auto text = FrameScript_Sprintf(L, 2, buffer, sizeof(buffer));
     string->SetText(text, 1);
     return 0;
 }
diff --git a/src/ui/FrameScript.cpp b/src/ui/FrameScript.cpp
index 22386a4..f5b5c9f 100644
--- a/src/ui/FrameScript.cpp
+++ b/src/ui/FrameScript.cpp
@@ -2,6 +2,7 @@
 #include "ui/FrameScriptInternal.hpp"
 #include "ui/FrameScript_Object.hpp"
 #include "ui/LuaMemory.hpp"
+#include "ui/LuaExtraFuncs.hpp"
 #include "util/CStatus.hpp"
 #include "util/Lua.hpp"
 #include "util/SFile.hpp"
@@ -451,26 +452,24 @@ void FrameScript_GetColor(lua_State* L, int32_t idx, CImVector& color) {
     color.Set(a, r, g, b);
 }
 
+int32_t SetDecimalConversion(int32_t enabled) {
+    return lua_setdecimalconversion(enabled);
+}
+
 lua_State* FrameScript_GetContext(void) {
     return FrameScript::s_context;
 }
 
-char* FrameScript_Sprintf(lua_State* L, int32_t idx, char* buffer, uint32_t size) {
+const char* FrameScript_Sprintf(lua_State* L, int32_t idx, char* buffer, uint32_t size) {
     size_t formatLength = 0;
     const char* format = luaL_checklstring(L, idx, &formatLength);
     const char* formatEnd = format + formatLength;
 
     char* result = buffer;
 
-    if (format >= formatEnd) {
-        *buffer = '\0';
-        return result;
-    }
-
-    
     int32_t currentIndex = idx;
 
-    while (size > 1) {
+    while (format < formatEnd && size > 1) {
         char character = *format++;
         if (character == '%') {
             char argument = *format;
@@ -552,7 +551,7 @@ char* FrameScript_Sprintf(lua_State* L, int32_t idx, char* buffer, uint32_t size
                     double number = luaL_checknumber(L, currentIndex);
                     size_t length = SStrPrintf(buffer, size, subformat, number);
                     if (length > 0) {
-                        // TODO: lua_convertdecimal(buffer)
+                        lua_convertdecimal(buffer);
                         buffer += length;
                         size -= length;
                     }
@@ -584,7 +583,7 @@ char* FrameScript_Sprintf(lua_State* L, int32_t idx, char* buffer, uint32_t size
                     auto number = static_cast<int32_t>(luaL_checknumber(L, currentIndex));
                     size_t length = SStrPrintf(buffer, size, subformat, number);
                     if (length > 0) {
-                        // TODO: lua_convertdecimal(buffer)
+                        lua_convertdecimal(buffer);
                         buffer += length;
                         size -= length;
                     }
@@ -612,10 +611,6 @@ char* FrameScript_Sprintf(lua_State* L, int32_t idx, char* buffer, uint32_t size
             *buffer++ = character;
             --size;
         }
-
-        if (format >= formatEnd) {
-            break;
-        }
     }
 
     *buffer = '\0';
diff --git a/src/ui/FrameScript.hpp b/src/ui/FrameScript.hpp
index a9f12f0..11af907 100644
--- a/src/ui/FrameScript.hpp
+++ b/src/ui/FrameScript.hpp
@@ -78,9 +78,11 @@ void FrameScript_Flush();
 
 void FrameScript_GetColor(lua_State* L, int32_t idx, CImVector& color);
 
+int32_t SetDecimalConversion(int32_t enabled);
+
 lua_State* FrameScript_GetContext();
 
-char* FrameScript_Sprintf(lua_State * L, int32_t idx, char* buffer, uint32_t size);
+const char* FrameScript_Sprintf(lua_State * L, int32_t idx, char* buffer, uint32_t size);
 
 const char* FrameScript_GetCurrentObject(lua_State* L, int32_t a2);
 
diff --git a/src/ui/LuaExtraFuncs.cpp b/src/ui/LuaExtraFuncs.cpp
index 71664a3..f7362a3 100644
--- a/src/ui/LuaExtraFuncs.cpp
+++ b/src/ui/LuaExtraFuncs.cpp
@@ -5,6 +5,10 @@
 #include "util/Unimplemented.hpp"
 #include <cstdint>
 
+
+static bool s_luaDecimalConversion = false;
+
+
 luaL_Reg FrameScriptInternal::extra_funcs[31] = {
     { "setglobal", &sub_8168D0 },
     { "getglobal", &sub_816910 },
@@ -169,3 +173,53 @@ int32_t debuglocals(lua_State* L) {
 int32_t scrub(lua_State* L) {
     WHOA_UNIMPLEMENTED(0);
 }
+
+int32_t lua_setdecimalconversion(int32_t enabled) {
+    s_luaDecimalConversion = (enabled != 0);
+    return static_cast<int32_t>(s_luaDecimalConversion);
+}
+
+void lua_convertdecimal(char* string) {
+    if (!s_luaDecimalConversion) {
+        return;
+    }
+
+    size_t length = SStrLen(string);
+    if (!length) {
+        return;
+    }
+
+    char* end = &string[length];
+    while (string < end) {
+        if (*string < '0' || *string > '9') {
+            ++string;
+            continue;
+        }
+
+        char ch;
+        while (true) {
+            ch = *string;
+
+            if ((ch < '0' || ch > '9') && ch != '.') {
+                break;
+            }
+
+            if (ch == ',') {
+LABEL_13:
+                if (string[1] >= '0' && string[1] <= '9') {
+                    *string = '.';
+                }
+            } else {
+                if (ch == '.' && (string[1] < '0' || string[1] > '9')) {
+                    *string = ',';
+                }
+            }
+            ++string;
+        }
+        if (ch == ',') {
+            goto LABEL_13;
+        }
+
+        ++string;
+    }
+}
diff --git a/src/ui/LuaExtraFuncs.hpp b/src/ui/LuaExtraFuncs.hpp
index c4f8966..0cf4542 100644
--- a/src/ui/LuaExtraFuncs.hpp
+++ b/src/ui/LuaExtraFuncs.hpp
@@ -36,4 +36,7 @@ int32_t debugstack(lua_State*);
 int32_t debuglocals(lua_State*);
 int32_t scrub(lua_State*);
 
+int32_t lua_setdecimalconversion(int32_t enabled);
+void lua_convertdecimal(char* string);
+
 #endif