diff --git a/Core/FileLoaders/DiskCachingFileLoader.cpp b/Core/FileLoaders/DiskCachingFileLoader.cpp
index ac3fdbd694..4e414297b9 100644
--- a/Core/FileLoaders/DiskCachingFileLoader.cpp
+++ b/Core/FileLoaders/DiskCachingFileLoader.cpp
@@ -91,7 +91,7 @@ size_t DiskCachingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data,
 	if (absolutePos >= filesize_) {
 		bytes = 0;
 	} else if (absolutePos + (s64)bytes >= filesize_) {
-		bytes = filesize_ - absolutePos;
+		bytes = (size_t)(filesize_ - absolutePos);
 	}
 
 	if (cache_ && cache_->IsValid() && (flags & Flags::HINT_UNCACHED) == 0) {
@@ -226,13 +226,13 @@ size_t DiskCachingFileLoaderCache::ReadFromCache(s64 pos, size_t bytes, void *da
 		return 0;
 	}
 
-	s64 cacheStartPos = pos / blockSize_;
-	s64 cacheEndPos = (pos + bytes - 1) / blockSize_;
+	size_t cacheStartPos = (size_t)(pos / blockSize_);
+	size_t cacheEndPos = (size_t)((pos + bytes - 1) / blockSize_);
 	size_t readSize = 0;
 	size_t offset = (size_t)(pos - (cacheStartPos * (u64)blockSize_));
 	u8 *p = (u8 *)data;
 
-	for (s64 i = cacheStartPos; i <= cacheEndPos; ++i) {
+	for (size_t i = cacheStartPos; i <= cacheEndPos; ++i) {
 		auto &info = index_[i];
 		if (info.block == INVALID_BLOCK) {
 			return readSize;
@@ -262,14 +262,14 @@ size_t DiskCachingFileLoaderCache::SaveIntoCache(FileLoader *backend, s64 pos, s
 		return backend->ReadAt(pos, bytes, data, flags);
 	}
 
-	s64 cacheStartPos = pos / blockSize_;
-	s64 cacheEndPos = (pos + bytes - 1) / blockSize_;
+	size_t cacheStartPos = (size_t)(pos / blockSize_);
+	size_t cacheEndPos = (size_t)((pos + bytes - 1) / blockSize_);
 	size_t readSize = 0;
 	size_t offset = (size_t)(pos - (cacheStartPos * (u64)blockSize_));
 	u8 *p = (u8 *)data;
 
 	size_t blocksToRead = 0;
-	for (s64 i = cacheStartPos; i <= cacheEndPos; ++i) {
+	for (size_t i = cacheStartPos; i <= cacheEndPos; ++i) {
 		auto &info = index_[i];
 		if (info.block != INVALID_BLOCK) {
 			break;
@@ -572,7 +572,7 @@ void DiskCachingFileLoaderCache::LoadCacheIndex() {
 		return;
 	}
 
-	indexCount_ = (filesize_ + blockSize_ - 1) / blockSize_;
+	indexCount_ = (size_t)((filesize_ + blockSize_ - 1) / blockSize_);
 	index_.resize(indexCount_);
 	blockIndexLookup_.resize(maxBlocks_);
 	memset(&blockIndexLookup_[0], INVALID_INDEX, maxBlocks_ * sizeof(blockIndexLookup_[0]));
@@ -646,7 +646,7 @@ void DiskCachingFileLoaderCache::CreateCacheFile(const Path &path) {
 		return;
 	}
 
-	indexCount_ = (filesize_ + blockSize_ - 1) / blockSize_;
+	indexCount_ = (size_t)((filesize_ + blockSize_ - 1) / blockSize_);
 	index_.clear();
 	index_.resize(indexCount_);
 	blockIndexLookup_.resize(maxBlocks_);