diff --git a/src/audio_format.c b/src/audio_format.c
index 799e0dd89..458ec3b13 100644
--- a/src/audio_format.c
+++ b/src/audio_format.c
@@ -28,6 +28,25 @@
 #define REVERSE_ENDIAN_SUFFIX "_be"
 #endif
 
+void
+audio_format_mask_apply(struct audio_format *af,
+			const struct audio_format *mask)
+{
+	assert(audio_format_valid(af));
+	assert(audio_format_mask_valid(mask));
+
+	if (mask->sample_rate != 0)
+		af->sample_rate = mask->sample_rate;
+
+	if (mask->format != SAMPLE_FORMAT_UNDEFINED)
+		af->format = mask->format;
+
+	if (mask->channels != 0)
+		af->channels = mask->channels;
+
+	assert(audio_format_valid(af));
+}
+
 const char *
 sample_format_to_string(enum sample_format format)
 {
diff --git a/src/audio_format.h b/src/audio_format.h
index 8c2906d5f..43bfe2d6a 100644
--- a/src/audio_format.h
+++ b/src/audio_format.h
@@ -221,24 +221,9 @@ static inline bool audio_format_equals(const struct audio_format *a,
 		a->reverse_endian == b->reverse_endian;
 }
 
-static inline void
+void
 audio_format_mask_apply(struct audio_format *af,
-			const struct audio_format *mask)
-{
-	assert(audio_format_valid(af));
-	assert(audio_format_mask_valid(mask));
-
-	if (mask->sample_rate != 0)
-		af->sample_rate = mask->sample_rate;
-
-	if (mask->format != SAMPLE_FORMAT_UNDEFINED)
-		af->format = mask->format;
-
-	if (mask->channels != 0)
-		af->channels = mask->channels;
-
-	assert(audio_format_valid(af));
-}
+			const struct audio_format *mask);
 
 G_GNUC_CONST
 static inline unsigned