diff --git a/tools/src/scaninc/CMakeLists.txt b/tools/src/scaninc/CMakeLists.txt
index ec335c3a..8f8bbc3e 100644
--- a/tools/src/scaninc/CMakeLists.txt
+++ b/tools/src/scaninc/CMakeLists.txt
@@ -2,5 +2,6 @@ file(GLOB_RECURSE sources *.cpp)
 
 add_executable(scaninc ${sources})
 target_include_directories(scaninc PRIVATE .)
+target_link_libraries(scaninc PRIVATE project_settings fmt::fmt)
 
 install(TARGETS scaninc RUNTIME DESTINATION bin)
diff --git a/tools/src/scaninc/asm_file.cpp b/tools/src/scaninc/asm_file.cpp
index 0fa0a20d..37aeb933 100644
--- a/tools/src/scaninc/asm_file.cpp
+++ b/tools/src/scaninc/asm_file.cpp
@@ -33,7 +33,7 @@ AsmFile::AsmFile(std::string path) {
 
     std::fseek(fp, 0, SEEK_END);
 
-    m_size = std::ftell(fp);
+    m_size = static_cast<size_t>(std::ftell(fp));
 
     m_buffer = new char[m_size];
 
@@ -60,8 +60,7 @@ IncDirectiveType AsmFile::ReadUntilIncDirective(std::string& path) {
 
         IncDirectiveType incDirectiveType = IncDirectiveType::None;
 
-        char c = PeekChar();
-        if (c == '.' || c == '#') {
+        if (char c = static_cast<char>(PeekChar()); c == '.' || c == '#') {
             m_pos++;
 
             if (MatchIncDirective("incbin", path))
@@ -95,8 +94,8 @@ IncDirectiveType AsmFile::ReadUntilIncDirective(std::string& path) {
 }
 
 std::string AsmFile::ReadPath() {
-    int length = 0;
-    int startPos = m_pos;
+    size_t length = 0;
+    size_t startPos = m_pos;
 
     for (;;) {
         int c = GetChar();
diff --git a/tools/src/scaninc/asm_file.h b/tools/src/scaninc/asm_file.h
index 1f07b169..4ee0fddf 100644
--- a/tools/src/scaninc/asm_file.h
+++ b/tools/src/scaninc/asm_file.h
@@ -34,8 +34,8 @@ class AsmFile {
 
   private:
     char* m_buffer;
-    int m_pos;
-    int m_size;
+    size_t m_pos;
+    size_t m_size;
     int m_lineNum;
     std::string m_path;
 
@@ -74,8 +74,8 @@ class AsmFile {
     }
 
     bool MatchIncDirective(std::string directiveName, std::string& path) {
-        int length = directiveName.length();
-        int i;
+        size_t length = directiveName.length();
+        size_t i;
 
         for (i = 0; i < length && m_pos + i < m_size; i++)
             if (directiveName[i] != m_buffer[m_pos + i])
diff --git a/tools/src/scaninc/c_file.cpp b/tools/src/scaninc/c_file.cpp
index b567d646..fca672e8 100644
--- a/tools/src/scaninc/c_file.cpp
+++ b/tools/src/scaninc/c_file.cpp
@@ -30,7 +30,7 @@ CFile::CFile(std::string path) {
 
     std::fseek(fp, 0, SEEK_END);
 
-    m_size = std::ftell(fp);
+    m_size = static_cast<size_t>(std::ftell(fp));
 
     m_buffer = new char[m_size + 1];
     m_buffer[m_size] = 0;
@@ -144,7 +144,7 @@ void CFile::SkipWhitespace() {
 bool CFile::CheckIdentifier(const std::string& ident) {
     unsigned int i;
 
-    for (i = 0; i < ident.length() && m_pos + i < (unsigned)m_size; i++)
+    for (i = 0; i < ident.length() && m_pos + i < m_size; i++)
         if (ident[i] != m_buffer[m_pos + i])
             return false;
 
@@ -193,8 +193,8 @@ void CFile::CheckIncbin() {
     if (incbinType == -1)
         return;
 
-    long oldPos = m_pos;
-    long oldLineNum = m_lineNum;
+    auto oldPos = m_pos;
+    auto oldLineNum = m_lineNum;
 
     m_pos += idents[incbinType].length();
 
@@ -239,7 +239,7 @@ std::string CFile::ReadPath() {
 
     m_pos++;
 
-    int startPos = m_pos;
+    auto startPos = m_pos;
 
     while (m_buffer[m_pos] != '"') {
         if (m_buffer[m_pos] == 0) {
diff --git a/tools/src/scaninc/c_file.h b/tools/src/scaninc/c_file.h
index 2d4fc688..f09b7e3e 100644
--- a/tools/src/scaninc/c_file.h
+++ b/tools/src/scaninc/c_file.h
@@ -40,8 +40,8 @@ class CFile {
 
   private:
     char* m_buffer;
-    int m_pos;
-    int m_size;
+    size_t m_pos;
+    size_t m_size;
     int m_lineNum;
     std::string m_path;
     std::set<std::string> m_incbins;
diff --git a/tools/src/scaninc/scaninc.h b/tools/src/scaninc/scaninc.h
index 92bff804..d48fb7a7 100644
--- a/tools/src/scaninc/scaninc.h
+++ b/tools/src/scaninc/scaninc.h
@@ -23,6 +23,7 @@
 
 #include <cstdio>
 #include <cstdlib>
+#include <fmt/format.h>
 
 #ifdef _MSC_VER
 
@@ -40,18 +41,23 @@
 
 #else
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
+
 #define FATAL_INPUT_ERROR(format, ...)                                              \
     do {                                                                            \
-        fprintf(stderr, "%s:%d " format, m_path.c_str(), m_lineNum, ##__VA_ARGS__); \
+        fmt::print(stderr, "%s:%d " format, m_path.c_str(), m_lineNum, ##__VA_ARGS__); \
         exit(1);                                                                    \
     } while (0)
 
 #define FATAL_ERROR(format, ...)                \
     do {                                        \
-        fprintf(stderr, format, ##__VA_ARGS__); \
+        fmt::print(stderr, format, ##__VA_ARGS__); \
         exit(1);                                \
     } while (0)
 
+#pragma GCC diagnostic pop
+
 #endif // _MSC_VER
 
 #define SCANINC_MAX_PATH 255