diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index 91700ec..85844bc 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -67,7 +67,7 @@ class BuiltinFunctions
     {
         this.func ~= func;
     }
-    BuiltinFunction overloadResolution(int argc, int outargc)
+    BuiltinFunction overloadResolution(size_t argc, size_t outargc)
     {
         BuiltinFunction va;
         //とりあえず引数の数で解決させる,というよりコンパイル時に型を取得する方法がない
diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index 90970c7..c68ce77 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -8,7 +8,7 @@ import otya.smilebasic.systemvariable;
 import std.stdio;
 class DebugInfo
 {
-    int old;
+    sizediff_t old;
     std.container.Array!SourceLocation location;
     this()
     {
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 86bd828..856af56 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -387,9 +387,9 @@ class Parser
     wstring getLine(SourceLocation loc)
     {
         import std.string;
-        int mae = code[0 .. loc.pos2].lastIndexOf('\n');
+        auto mae = code[0 .. loc.pos2].lastIndexOf('\n');
         mae++;
-        int ushiro = code[mae..$].indexOf('\n');
+        auto ushiro = code[mae..$].indexOf('\n');
         if(ushiro == -1) ushiro = code.length;
         return code[mae .. mae + ushiro];
     }
diff --git a/SMILEBASIC/project.d b/SMILEBASIC/project.d
index 3f51bce..7c74def 100644
--- a/SMILEBASIC/project.d
+++ b/SMILEBASIC/project.d
@@ -115,4 +115,4 @@ class Projects
         contents = readText(path).to!wstring;
         return true;
     }
-}
\ No newline at end of file
+}