diff --git a/libavcodec/vorbis.h b/libavcodec/vorbis.h
index 270855da04..0dd109dd2e 100644
--- a/libavcodec/vorbis.h
+++ b/libavcodec/vorbis.h
@@ -45,7 +45,6 @@ int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num);
 void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
                                   uint16_t *y_list, int *flag,
                                   int multiplier, float * out, int samples);
-void ff_vorbis_inverse_coupling(float *mag, float *ang, ptrdiff_t blocksize);
 
 #define ilog(i) av_log2(2*(i))
 
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
index 72b8e8e15b..0d04e7c2c4 100644
--- a/libavcodec/vorbisdec.c
+++ b/libavcodec/vorbisdec.c
@@ -1579,29 +1579,6 @@ static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
     }
 }
 
-void ff_vorbis_inverse_coupling(float *mag, float *ang, ptrdiff_t blocksize)
-{
-    for (ptrdiff_t i = 0;  i < blocksize;  i++) {
-        float angi = ang[i], magi = mag[i];
-
-        if (magi > 0.f) {
-            if (angi > 0.f) {
-                ang[i] = magi - angi;
-            } else {
-                ang[i] = magi;
-                mag[i] = magi + angi;
-            }
-        } else {
-            if (angi > 0.f) {
-                ang[i] = magi + angi;
-            } else {
-                ang[i] = magi;
-                mag[i] = magi - angi;
-            }
-        }
-    }
-}
-
 // Decode the audio packet using the functions above
 
 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
diff --git a/libavcodec/vorbisdsp.c b/libavcodec/vorbisdsp.c
index e94b65cb7b..693c44dfcb 100644
--- a/libavcodec/vorbisdsp.c
+++ b/libavcodec/vorbisdsp.c
@@ -19,11 +19,33 @@
 #include "config.h"
 #include "libavutil/attributes.h"
 #include "vorbisdsp.h"
-#include "vorbis.h"
+
+static void vorbis_inverse_coupling_c(float *mag, float *ang, ptrdiff_t blocksize)
+{
+    for (ptrdiff_t i = 0;  i < blocksize;  i++) {
+        float angi = ang[i], magi = mag[i];
+
+        if (magi > 0.f) {
+            if (angi > 0.f) {
+                ang[i] = magi - angi;
+            } else {
+                ang[i] = magi;
+                mag[i] = magi + angi;
+            }
+        } else {
+            if (angi > 0.f) {
+                ang[i] = magi + angi;
+            } else {
+                ang[i] = magi;
+                mag[i] = magi - angi;
+            }
+        }
+    }
+}
 
 av_cold void ff_vorbisdsp_init(VorbisDSPContext *dsp)
 {
-    dsp->vorbis_inverse_coupling = ff_vorbis_inverse_coupling;
+    dsp->vorbis_inverse_coupling = vorbis_inverse_coupling_c;
 
 #if ARCH_AARCH64
     ff_vorbisdsp_init_aarch64(dsp);