diff --git a/library/library.pro b/library/library.pro
index a4bb815..b0a8022 100644
--- a/library/library.pro
+++ b/library/library.pro
@@ -2,7 +2,7 @@ TEMPLATE = lib
 TARGET = mobilisis_calc
 #CONFIG += staticlib
 
-QMAKE_CXXFLAGS += -std=c++17 -g -O0
+QMAKE_CXXFLAGS += -std=c++17 -g -O
 
 INCLUDEPATH += $$_PRO_FILE_PWD_/include
 INCLUDEPATH += $$_PRO_FILE_PWD_/include/mobilisis