diff --git a/pcm_wave_header.hpp b/pcm_wave_header.hpp
index 9ad7a53..88da97c 100644
--- a/pcm_wave_header.hpp
+++ b/pcm_wave_header.hpp
@@ -40,10 +40,10 @@
 
 struct PCMWaveHeader
 {
-    int8_t chunkID[4];
+    uint8_t chunkID[4];
     uint32_t chunkSize;
-    int8_t format[4];
-    int8_t subchunk1ID[4];
+    uint8_t format[4];
+    uint8_t subchunk1ID[4];
     uint32_t subchunk1Size;
     uint16_t audioFormat;
     uint16_t channels;
@@ -51,7 +51,7 @@ struct PCMWaveHeader
     uint32_t byteRate;
     uint16_t blockAlign;
     uint16_t bitsPerSample;
-    int8_t subchunk2ID[4];
+    uint8_t subchunk2ID[4];
     uint32_t subchunk2Size;
 };