diff --git a/src/DecoderAPI.cxx b/src/DecoderAPI.cxx
index 87d104465..4fea02bef 100644
--- a/src/DecoderAPI.cxx
+++ b/src/DecoderAPI.cxx
@@ -35,6 +35,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 
 void
 decoder_initialized(Decoder &decoder,