diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 4148264eb1..b2fdd32458 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1562,9 +1562,14 @@ size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_ta
 {
     int i, len, ret = 0;
 
+#define TAG_PRINT(x)                                              \
+    (((x) >= '0' && (x) <= '9') ||                                \
+     ((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') ||  \
+     ((x) == '.' || (x) == ' '))
+
     for (i = 0; i < 4; i++) {
         len = snprintf(buf, buf_size,
-                       isprint(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);
+                       TAG_PRINT(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);
         buf        += len;
         buf_size    = buf_size > len ? buf_size - len : 0;
         ret        += len;