diff --git a/src/reader_lcf.cpp b/src/reader_lcf.cpp
index 55587f02..386c8b0a 100644
--- a/src/reader_lcf.cpp
+++ b/src/reader_lcf.cpp
@@ -290,7 +290,7 @@ void LcfReader::Skip(const struct LcfReader::Chunk& chunk_info, const char* wher
 		LcfReader::Read(byte);
 		ss << std::setfill('0') << std::setw(2) << (int)byte << " ";
 		if ((i+1) % 16 == 0) {
-			Log::Debug(ss.str().c_str());
+			Log::Debug("%s", ss.str().c_str());
 			ss.str("");
 		}
 		if (Eof()) {
@@ -298,7 +298,7 @@ void LcfReader::Skip(const struct LcfReader::Chunk& chunk_info, const char* wher
 		}
 	}
 	if (!ss.str().empty()) {
-		Log::Debug(ss.str().c_str());
+		Log::Debug("%s", ss.str().c_str());
 	}
 }
 
diff --git a/src/reader_struct.h b/src/reader_struct.h
index 960282fe..05551e46 100644
--- a/src/reader_struct.h
+++ b/src/reader_struct.h
@@ -196,7 +196,7 @@ struct Primitive {
 
 		if (dif != 0) {
 			// Fix incorrect read pointer position
-			Log::Warning("Invalid %s at %X", typeid(T).name(), stream.Tell());
+			Log::Warning("Invalid %s at %" PRIX32 "", typeid(T).name(), stream.Tell());
 			stream.Seek(dif, LcfReader::FromCurrent);
 		}
 	}
diff --git a/src/writer_lcf.cpp b/src/writer_lcf.cpp
index 0893778a..b679b66b 100644
--- a/src/writer_lcf.cpp
+++ b/src/writer_lcf.cpp
@@ -56,7 +56,7 @@ void LcfWriter::WriteInt(int val) {
 
 void LcfWriter::WriteUInt64(uint64_t value) {
 	for (int i = 56; i >= 0; i -= 7)
-		if (value >= (1LL << i) || i == 0)
+		if (value >= (1ULL << i) || i == 0)
 			Write<uint8_t>((uint8_t)(((value >> i) & 0x7F) | (i > 0 ? 0x80 : 0)));
 }