diff --git a/libavcodec/ac3enc_fixed.c b/libavcodec/ac3enc_fixed.c
index 15c5a4bca7..ed8992ebff 100644
--- a/libavcodec/ac3enc_fixed.c
+++ b/libavcodec/ac3enc_fixed.c
@@ -32,8 +32,8 @@
 
 #define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED
 #include "ac3enc_opts_template.c"
-static AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_item_name,
-                                ac3fixed_options, LIBAVUTIL_VERSION_INT };
+static const AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_item_name,
+                                      ac3fixed_options, LIBAVUTIL_VERSION_INT };
 
 #include "ac3enc_template.c"
 
diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index deec79ce8f..776d185fa4 100644
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -35,8 +35,8 @@
 #if CONFIG_AC3_ENCODER
 #define AC3ENC_TYPE AC3ENC_TYPE_AC3
 #include "ac3enc_opts_template.c"
-static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
-                                ac3_options, LIBAVUTIL_VERSION_INT };
+static const AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
+                                      ac3_options, LIBAVUTIL_VERSION_INT };
 #endif
 
 #include "ac3enc_template.c"
diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c
index f39b9f1925..0433db49d7 100644
--- a/libavcodec/eac3enc.c
+++ b/libavcodec/eac3enc.c
@@ -31,8 +31,8 @@
 
 #define AC3ENC_TYPE AC3ENC_TYPE_EAC3
 #include "ac3enc_opts_template.c"
-static AVClass eac3enc_class = { "E-AC-3 Encoder", av_default_item_name,
-                                 eac3_options, LIBAVUTIL_VERSION_INT };
+static const AVClass eac3enc_class = { "E-AC-3 Encoder", av_default_item_name,
+                                       eac3_options, LIBAVUTIL_VERSION_INT };
 
 
 void ff_eac3_set_cpl_states(AC3EncodeContext *s)