diff --git a/Source/ResourceEditor.cpp b/Source/ResourceEditor.cpp
index e93a65c0..c9f11f87 100644
--- a/Source/ResourceEditor.cpp
+++ b/Source/ResourceEditor.cpp
@@ -280,7 +280,7 @@ BYTE* CResourceEditor::Save(DWORD &dwSize) {
 		sectionHeadersArray[i].PointerToRawData -= IMAGE_FIRST_SECTION(m_ntHeaders)[m_dwResourceSectionIndex].SizeOfRawData;
 		sectionHeadersArray[i].PointerToRawData += dwRsrcSizeAligned;
 		int secInDataDir = 0;
-		for (int j = 0; j < ntHeaders->OptionalHeader.NumberOfRvaAndSizes; j++)
+		for (unsigned int j = 0; j < ntHeaders->OptionalHeader.NumberOfRvaAndSizes; j++)
 			if (ntHeaders->OptionalHeader.DataDirectory[j].VirtualAddress == sectionHeadersArray[i].VirtualAddress)
 				secInDataDir = j;
 		sectionHeadersArray[i].VirtualAddress -= RALIGN(dwOldVirtualSize, ntHeaders->OptionalHeader.SectionAlignment);
diff --git a/Source/build.cpp b/Source/build.cpp
index 6f96b3fe..16bfc87d 100644
--- a/Source/build.cpp
+++ b/Source/build.cpp
@@ -426,7 +426,7 @@ int CEXEBuild::add_string_main(const char *string, int process) // returns offse
       if (build_userlangstrings.find(cp, 0, &idx) < 0) idx = -1;
     }
     free(cp);
-    if (idx >= 0) return -(idx+1+(sizeof(common_strings)+sizeof(installer_strings))/sizeof(int));
+    if (idx >= 0) return -((int)(idx+1+(sizeof(common_strings)+sizeof(installer_strings))/sizeof(int)));
   }
 
   if (!process) return build_strlist.add(string,2);
@@ -449,7 +449,7 @@ int CEXEBuild::add_string_uninst(const char *string, int process) // returns off
       if (ubuild_userlangstrings.find(cp, 0, &idx) < 0) idx = -1;
     }
     free(cp);
-    if (idx >= 0) return -(idx+1+(sizeof(common_strings)+sizeof(uninstall_strings))/sizeof(int));
+    if (idx >= 0) return -((int)(idx+1+(sizeof(common_strings)+sizeof(uninstall_strings))/sizeof(int)));
   }
 
   if (!process) return ubuild_strlist.add(string,2);
diff --git a/Source/lang.cpp b/Source/lang.cpp
index c7f8cb52..fa043150 100644
--- a/Source/lang.cpp
+++ b/Source/lang.cpp
@@ -224,7 +224,7 @@ int CEXEBuild::SetUserString(char *name, LANGID lang, char *string, int process/
   }
 
   #define MAX(a, b) (a > b ? a : b)
-  user_strings->resize(MAX(user_strings->getlen(), (unsigned int)(idx+1)*sizeof(unsigned int)));
+  user_strings->resize(MAX((unsigned int)user_strings->getlen(), (idx+1)*sizeof(unsigned int)));
   ((int*)user_strings->get())[idx] = uninst ? add_string_uninst(string,process) : add_string_main(string,process);
 
   int zero = 0;
diff --git a/Source/script.cpp b/Source/script.cpp
index f5afb194..fd2afdf1 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -1571,7 +1571,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line, FILE *fp, const char
       SCRIPT_MSG("LoadLanguageFile: %s\n", line.gettoken_str(1));
       try {
         NLF *newNLF = new NLF(line.gettoken_str(1));
-        int i;
+        unsigned int i;
         for (i = 0; i < build_nlfs.size(); i++)
           if (build_nlfs[i]->GetLang() == newNLF->GetLang()) {
             ERROR_MSG("Error: Can't add same language twice!\n");