1 files changed, 3 insertions, 1 deletions
diff --git a/src/PJ_somerc.c b/src/PJ_somerc.c
index 02df5868..c6c3ff21 100644
--- a/src/PJ_somerc.c
+++ b/src/PJ_somerc.c
@@ -1,5 +1,8 @@
 #define PJ_LIB__
+
 #include <errno.h>
+#include <math.h>
+
 #include "proj.h"
 #include "projects.h"
 
@@ -87,4 +90,3 @@ PJ *PROJECTION(somerc) {
     P->fwd = e_forward;
     return P;
 }
-