diff --git a/flutter/linux/flutter/CMakeLists.txt b/flutter/linux/flutter/CMakeLists.txt
index d5bd01648..52af0069a 100644
--- a/flutter/linux/flutter/CMakeLists.txt
+++ b/flutter/linux/flutter/CMakeLists.txt
@@ -70,7 +70,7 @@ target_link_libraries(flutter INTERFACE
 add_dependencies(flutter flutter_assemble)
 
 # === Flutter tool backend ===
-# _phony_ is a non-existent file to force this command to run every time,
+# _phony_ is a nonexistent file to force this command to run every time,
 # since currently there's no way to get a full input/output list from the
 # flutter tool.
 add_custom_command(
diff --git a/flutter/windows/flutter/CMakeLists.txt b/flutter/windows/flutter/CMakeLists.txt
index 930d2071a..b5655b2fa 100644
--- a/flutter/windows/flutter/CMakeLists.txt
+++ b/flutter/windows/flutter/CMakeLists.txt
@@ -79,7 +79,7 @@ target_include_directories(flutter_wrapper_app PUBLIC
 add_dependencies(flutter_wrapper_app flutter_assemble)
 
 # === Flutter tool backend ===
-# _phony_ is a non-existent file to force this command to run every time,
+# _phony_ is a nonexistent file to force this command to run every time,
 # since currently there's no way to get a full input/output list from the
 # flutter tool.
 set(PHONY_OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/_phony_")