diff --git a/other-licenses/libart_lgpl/art_misc.h b/other-licenses/libart_lgpl/art_misc.h
index 24a29880a204..57da3dc50f9f 100644
--- a/other-licenses/libart_lgpl/art_misc.h
+++ b/other-licenses/libart_lgpl/art_misc.h
@@ -24,6 +24,7 @@
 #define __ART_MISC_H__
 
 #include <stdlib.h> /* for malloc, etc.  */
+#include <math.h>   /* for M_PI, M_SQRT2 */
 
 /* The art_config.h file is automatically generated by
    gen_art_config.c and contains definitions of