diff --git a/CMakeLists.txt b/CMakeLists.txt
index 620b2e4..16fd81a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ INCLUDE_DIRECTORIES (inc)
 aux_source_directory(src DIRSRCS)
 aux_source_directory(src/pattern PaternSrc)
 
-add_library(General ${DIRSRCS} ${PaternSrc} src/pattern/signleton.h src/pattern/Observer.cpp src/pattern/Observer.h)
+add_library(General ${DIRSRCS} ${PaternSrc} src/pattern/signleton.h src/pattern/Observer.h)
 set(COPYITEM inc)
 file(GLOB INCLUDES ${PROJECT_SOURCE_DIR}/inc/*)
 file(COPY ${INCLUDES} DESTINATION ${LIBRARY_OUTPUT_PATH}/inc