diff --git a/doc/APIchanges b/doc/APIchanges
index a9bf1afd4c8cc8a67ab24e11d97d07a910701632..c4a4471ecceb13436cb061462f17a7a5565e2a81 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,10 @@ libavutil:     2017-10-21
 
 API changes, most recent first:
 
+=======
+2020-08-21 - xxxxxxxxxx - lavu 56.58.100 - avstring.h
+  Deprecate av_d2str(). Use av_asprintf() instead.
+
 2020-08-04 - xxxxxxxxxx - lavu 56.58.100 - channel_layout.h
   Add AV_CH_LAYOUT_22POINT2 together with its newly required pieces:
   AV_CH_TOP_SIDE_LEFT, AV_CH_TOP_SIDE_RIGHT, AV_CH_BOTTOM_FRONT_CENTER,
diff --git a/libavutil/avstring.c b/libavutil/avstring.c
index f4b8ed2b453a03535ffb4c0cb1c2c637058cf662..e33d4aac5199d6e13c5674f26026c3e727faf02c 100644
--- a/libavutil/avstring.c
+++ b/libavutil/avstring.c
@@ -136,6 +136,7 @@ end:
     return p;
 }
 
+#if FF_API_D2STR
 char *av_d2str(double d)
 {
     char *str = av_malloc(16);
@@ -143,6 +144,7 @@ char *av_d2str(double d)
         snprintf(str, 16, "%f", d);
     return str;
 }
+#endif
 
 #define WHITESPACES " \n\t\r"
 
diff --git a/libavutil/avstring.h b/libavutil/avstring.h
index 274335cfb9c5a4edf5ccab031081d98b6238a618..ee225585b3dcd6c6e2f97124d9a2b026667e606a 100644
--- a/libavutil/avstring.h
+++ b/libavutil/avstring.h
@@ -24,6 +24,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include "attributes.h"
+#include "version.h"
 
 /**
  * @addtogroup lavu_string
@@ -155,10 +156,14 @@ static inline size_t av_strnlen(const char *s, size_t len)
  */
 char *av_asprintf(const char *fmt, ...) av_printf_format(1, 2);
 
+#if FF_API_D2STR
 /**
  * Convert a number to an av_malloced string.
+ * @deprecated  use av_asprintf() with "%f" or a more specific format
  */
+attribute_deprecated
 char *av_d2str(double d);
+#endif
 
 /**
  * Unescape the given string until a non escaped terminating char,
diff --git a/libavutil/tests/avstring.c b/libavutil/tests/avstring.c
index 887bd25a1266f8f6547cff99d3d761403011c207..37a2cf1833426a2329cbe59c9771fb3c1ced68f3 100644
--- a/libavutil/tests/avstring.c
+++ b/libavutil/tests/avstring.c
@@ -109,6 +109,8 @@ int main(void)
     TEST_STRIREPLACE(haystack, needle [2], "Education consists mainly in what we have instead.");
     TEST_STRIREPLACE(haystack, needle [1], "Education consists mainly in what we have instead");
 
+#if FF_API_D2STR
+FF_DISABLE_DEPRECATION_WARNINGS
     /*Testing av_d2str()*/
     #define TEST_D2STR(value, expected) \
         if((ptr = av_d2str(value)) == NULL){ \
@@ -121,5 +123,7 @@ int main(void)
     TEST_D2STR(0         ,  "0.000000");
     TEST_D2STR(-1.2333234, "-1.233323");
     TEST_D2STR(-1.2333237, "-1.233324");
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
     return 0;
 }
diff --git a/libavutil/version.h b/libavutil/version.h
index 3e7e1f410b146b023e35411961e0529166f77ccd..3f0a4a840250df587b4d916f07f6689a7c8fa1d6 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -132,6 +132,9 @@
 #ifndef FF_API_CHILD_CLASS_NEXT
 #define FF_API_CHILD_CLASS_NEXT         (LIBAVUTIL_VERSION_MAJOR < 57)
 #endif
+#ifndef FF_API_D2STR
+#define FF_API_D2STR                    (LIBAVUTIL_VERSION_MAJOR < 58)
+#endif
 
 /**
  * @}