diff --git a/examples/calculator/CMakeLists.txt b/examples/calculator/CMakeLists.txt
index 60d2d14d7..dae6ee3b4 100644
--- a/examples/calculator/CMakeLists.txt
+++ b/examples/calculator/CMakeLists.txt
@@ -17,7 +17,7 @@ set(CALC_HEADER_FILES
 
 add_executable(calculator
   ${CALC_SOURCE_FILES}
-  ${CALC_HEAEDR_FILES}
+  ${CALC_HEADER_FILES}
 )
 
 target_link_libraries(calculator QtNodes)
@@ -33,7 +33,7 @@ set(HEADLESS_CALC_SOURCE_FILES
 
 add_executable(headless_calculator 
   ${HEADLESS_CALC_SOURCE_FILES}
-  ${CALC_HEAEDR_FILES}
+  ${CALC_HEADER_FILES}
 )
 
 target_link_libraries(headless_calculator QtNodes)