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-rw-r--r--libcrystfel/src/libcrystfel-version.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libcrystfel/src/libcrystfel-version.h b/libcrystfel/src/libcrystfel-version.h
index 7e3ac4f7..837b8299 100644
--- a/libcrystfel/src/libcrystfel-version.h
+++ b/libcrystfel/src/libcrystfel-version.h
@@ -1,2 +1,5 @@
+#ifndef LIBCRYSTFEL_VERSION_H
+#define LIBCRYSTFEL_VERSION_H
extern const char *libcrystfel_version_string(void);
extern const char *libcrystfel_licence_string(void);
+#endif