diff --git a/spa/plugins/audioconvert/fmt-ops-sse2.c b/spa/plugins/audioconvert/fmt-ops-sse2.c
index dff64fc8f..dcba6d2e1 100644
--- a/spa/plugins/audioconvert/fmt-ops-sse2.c
+++ b/spa/plugins/audioconvert/fmt-ops-sse2.c
@@ -496,7 +496,7 @@ conv_s24_to_f32d_sse2(struct convert *conv, void * SPA_RESTRICT dst[], const voi
 		conv_s24_to_f32d_1s_sse2(conv, &dst[i], &s[3*i], n_channels, n_samples);
 }
 
-void
+static void
 conv_s32_to_f32d_4s_sse2(void *data, void * SPA_RESTRICT dst[], const void * SPA_RESTRICT src,
 		uint32_t n_channels, uint32_t n_samples)
 {