diff --git a/src/prim/windows/windbg/mimalloc_windbg_process_info.cpp b/src/prim/windows/windbg/mimalloc_windbg_process_info.cpp
index 5dd7e977..bea82832 100644
--- a/src/prim/windows/windbg/mimalloc_windbg_process_info.cpp
+++ b/src/prim/windows/windbg/mimalloc_windbg_process_info.cpp
@@ -83,7 +83,7 @@ extern "C" __declspec(dllexport) HRESULT CALLBACK mi_dump_process_info(PDEBUG_CL
     // Convert wide string to narrow string
     std::string commandLine;
     commandLine.resize(cmdLine.Length / sizeof(WCHAR) + 1); // +1 for null terminator
-    WideCharToMultiByte(CP_UTF8, 0, commandLineWide.c_str(), -1, commandLine.data(), commandLine.size(), nullptr, nullptr);
+    WideCharToMultiByte(CP_UTF8, 0, commandLineWide.c_str(), -1, commandLine.data(), static_cast<int>(commandLine.size()), nullptr, nullptr);
 
     // Get Processor Type (x86, x64, ARM64, etc.)
     ULONG processorType = 0;
diff --git a/src/prim/windows/windbg/mimalloc_windbg_utils.cpp b/src/prim/windows/windbg/mimalloc_windbg_utils.cpp
index 86c40479..22a894e2 100644
--- a/src/prim/windows/windbg/mimalloc_windbg_utils.cpp
+++ b/src/prim/windows/windbg/mimalloc_windbg_utils.cpp
@@ -187,12 +187,12 @@ size_t mi_bitmap_count(mi_bitmap_t* bmp) {
     return totalCount;
 }
 
-std::string FormatSize(std::size_t bytes) {
+std::string FormatSize(int64_t value) {
     const char* suffixes[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB"};
     constexpr int maxIndex = static_cast<int>(std::size(suffixes)) - 1;
-    double size = static_cast<double>(bytes);
     int index = 0;
 
+    double size = static_cast<double>(value);
     while (size >= 1024.0 && index < maxIndex) {
         size /= 1024.0;
         ++index;
@@ -201,11 +201,12 @@ std::string FormatSize(std::size_t bytes) {
     return std::format("{:.2f} {}", size, suffixes[index]);
 }
 
-std::string FormatNumber(double num) {
+std::string FormatNumber(int64_t value) {
     const char* suffixes[] = {"", "K", "M", "B", "T"};
     constexpr int maxIndex = static_cast<int>(std::size(suffixes)) - 1;
     int index = 0;
 
+    double num = static_cast<double>(value);
     while (num >= 1000.0 && index < maxIndex) {
         num /= 1000.0;
         ++index;
diff --git a/src/prim/windows/windbg/mimalloc_windbg_utils.h b/src/prim/windows/windbg/mimalloc_windbg_utils.h
index e3f74a22..15c5dd3a 100644
--- a/src/prim/windows/windbg/mimalloc_windbg_utils.h
+++ b/src/prim/windows/windbg/mimalloc_windbg_utils.h
@@ -37,8 +37,8 @@ HRESULT ReadMemory(ULONG64 address, void* outBuffer, ULONG bufferSize);
 HRESULT ReadString(const char* symbolName, std::string& outBuffer);
 HRESULT ReadWideString(ULONG64 address, std::wstring& outString, size_t maxLength = 1024);
 size_t mi_bitmap_count(mi_bitmap_t* bmp);
-std::string FormatSize(std::size_t bytes);
-std::string FormatNumber(double num);
+std::string FormatSize(int64_t bytes);
+std::string FormatNumber(int64_t num);
 
 inline void PrintLink(ULONG64 addr, std::string cmd, std::string linkText, std::string extraText = "") {
     g_DebugControl->ControlledOutput(DEBUG_OUTCTL_AMBIENT_DML, DEBUG_OUTPUT_NORMAL,