1 files changed, 3 insertions, 1 deletions
diff --git a/src/PJ_sch.c b/src/PJ_sch.c
index e9e67ff8..64e5cdb8 100644
--- a/src/PJ_sch.c
+++ b/src/PJ_sch.c
@@ -31,7 +31,10 @@
  ****************************************************************************/
 
 #define PJ_LIB__
+
 #include <errno.h>
+#include <math.h>
+
 #include "proj.h"
 #include "projects.h"
 #include "geocent.h"
@@ -225,4 +228,3 @@ PJ *PROJECTION(sch) {
 
     return setup(P);
 }
-