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-rw-r--r--src/output.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/output.h b/src/output.h
index 5cc3adc..017e319 100644
--- a/src/output.h
+++ b/src/output.h
@@ -13,7 +13,7 @@
#define SWI 0x21BB /* Clockwise Open Circle Arrow */
/* functions */
-void print_planhead();
+void print_planhead(void);
void print_planline(const wchar_t sign, const double depth, const double time, const double runtime, const gas_t *gas);
void print_planfoot(const decostate_t *ds);