diff --git a/tremor/mapping0.c b/tremor/mapping0.c
index c721b47dab..dd1b008a67 100644
--- a/tremor/mapping0.c
+++ b/tremor/mapping0.c
@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <math.h>
+#include <alloca.h>
 #include "ogg.h"
 #include "ivorbiscodec.h"
 #include "mdct.h"
diff --git a/tremor/sharedbook.c b/tremor/sharedbook.c
index d173d8aaf5..09405f2ca2 100644
--- a/tremor/sharedbook.c
+++ b/tremor/sharedbook.c
@@ -18,6 +18,7 @@
 #include <stdlib.h>
 #include <math.h>
 #include <string.h>
+#include <alloca.h>
 #include "ogg.h"
 #include "os.h"
 #include "misc.h"