1 files changed, 4 insertions, 2 deletions
diff --git a/src/PJ_wag3.c b/src/PJ_wag3.c
index 5db1e50f..6ae9ad28 100644
--- a/src/PJ_wag3.c
+++ b/src/PJ_wag3.c
@@ -1,6 +1,9 @@
 #define PJ_LIB__
-#include "projects.h"
+
 #include <errno.h>
+#include <math.h>
+
+#include "projects.h"
 
 PROJ_HEAD(wag3, "Wagner III") "\n\tPCyl., Sph.\n\tlat_ts=";
 
@@ -43,4 +46,3 @@ PJ *PROJECTION(wag3) {
 
     return P;
 }
-