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-rw-r--r--src/msfn.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/msfn.cpp b/src/msfn.cpp
index 999e73a7..cf6accf1 100644
--- a/src/msfn.cpp
+++ b/src/msfn.cpp
@@ -1,5 +1,6 @@
/* determine constant small m */
#include <math.h>
+#include "proj.h"
#include "projects.h"
double
pj_msfn(double sinphi, double cosphi, double es) {