diff --git a/ComplementaryScripts/increaseVersion.m b/ComplementaryScripts/increaseVersion.m
index 206ad212..ac1200e7 100644
--- a/ComplementaryScripts/increaseVersion.m
+++ b/ComplementaryScripts/increaseVersion.m
@@ -8,7 +8,7 @@ function increaseVersion(version)
 fid = fopen('../history.md','r');
 history = fscanf(fid,'%s');
 fclose(fid);
-if contains(history,['yeast' version ':'])
+if ~contains(history,['yeast' version ':'])
     error('ERROR: update history.md first')
 end