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-rw-r--r--src/statisticsFunctions/includes/variance.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/statisticsFunctions/includes/variance.h b/src/statisticsFunctions/includes/variance.h
index 4631da52..6ed0b36f 100644
--- a/src/statisticsFunctions/includes/variance.h
+++ b/src/statisticsFunctions/includes/variance.h
@@ -13,6 +13,8 @@
#ifndef __VARIANCE_H__
#define __VARIANCE_H__
+#include "subtraction.h"
+
#include "pow.h"
#include "sum.h"