1 files changed, 3 insertions, 1 deletions
diff --git a/src/PJ_lsat.c b/src/PJ_lsat.c
index 7e1567e1..810a1cba 100644
--- a/src/PJ_lsat.c
+++ b/src/PJ_lsat.c
@@ -1,6 +1,9 @@
 /* based upon Snyder and Linck, USGS-NMD */
 #define PJ_LIB__
+
 #include <errno.h>
+#include <math.h>
+
 #include "proj.h"
 #include "projects.h"
 
@@ -205,4 +208,3 @@ PJ *PROJECTION(lsat) {
 
     return P;
 }
-