diff --git a/miniz_zip.c b/miniz_zip.c
index 88ea5a9..69dcc27 100644
--- a/miniz_zip.c
+++ b/miniz_zip.c
@@ -2827,7 +2827,7 @@ mz_bool mz_zip_writer_add_mem_ex_v2(mz_zip_archive *pZip, const char *pArchive_n
     if (uncomp_size || (buf_size && !(level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)))
         bit_flags |= MZ_ZIP_LDH_BIT_FLAG_HAS_LOCATOR;
 
-    if (level_and_flags & MZ_ZIP_FLAG_UTF8_FILENAME)
+    if (!(level_and_flags & MZ_ZIP_FLAG_ASCII_FILENAME))
         bit_flags |= MZ_ZIP_GENERAL_PURPOSE_BIT_FLAG_UTF8;
 
     if ((int)level_and_flags < 0)
@@ -3106,7 +3106,7 @@ mz_bool mz_zip_writer_add_cfile(mz_zip_archive *pZip, const char *pArchive_name,
     mz_uint8 extra_data[MZ_ZIP64_MAX_CENTRAL_EXTRA_FIELD_SIZE];
     mz_zip_internal_state *pState;
 
-    if (level_and_flags & MZ_ZIP_FLAG_UTF8_FILENAME)
+    if (!(level_and_flags & MZ_ZIP_FLAG_ASCII_FILENAME))
         gen_flags |= MZ_ZIP_GENERAL_PURPOSE_BIT_FLAG_UTF8;
 
     if ((int)level_and_flags < 0)
diff --git a/miniz_zip.h b/miniz_zip.h
index 65812da..c4185ca 100644
--- a/miniz_zip.h
+++ b/miniz_zip.h
@@ -97,7 +97,7 @@ typedef enum
     MZ_ZIP_FLAG_VALIDATE_HEADERS_ONLY = 0x2000,     /* validate the local headers, but don't decompress the entire file and check the crc32 */
     MZ_ZIP_FLAG_WRITE_ZIP64 = 0x4000,               /* use the zip64 file format, instead of the original zip file format */
     MZ_ZIP_FLAG_WRITE_ALLOW_READING = 0x8000,
-    MZ_ZIP_FLAG_UTF8_FILENAME = 0x10000
+    MZ_ZIP_FLAG_ASCII_FILENAME = 0x10000
 } mz_zip_flags;
 
 typedef enum