diff --git a/src/pcm/SoxrResampler.cxx b/src/pcm/SoxrResampler.cxx
index 2508e816e..56b9760d5 100644
--- a/src/pcm/SoxrResampler.cxx
+++ b/src/pcm/SoxrResampler.cxx
@@ -28,6 +28,7 @@
 #include <soxr.h>
 
 #include <assert.h>
+#include <string.h>
 
 static constexpr Domain soxr_domain("soxr");