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-rw-r--r--src/adjlon.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/adjlon.cpp b/src/adjlon.cpp
index 784a90aa..52448c2e 100644
--- a/src/adjlon.cpp
+++ b/src/adjlon.cpp
@@ -1,5 +1,7 @@
/* reduce argument to range +/- PI */
#include <math.h>
+
+#include "proj.h"
#include "projects.h"
double adjlon (double lon) {