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-rw-r--r--src/velocity.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/velocity.cc b/src/velocity.cc
index 4ff398c..319dc82 100644
--- a/src/velocity.cc
+++ b/src/velocity.cc
@@ -26,6 +26,8 @@
*/
#include "velocity.h"
+#include <stdlib.h>
+
Velocity::Velocity(unsigned int lower, unsigned int upper)
{
this->lower = lower;