Fix wrong grammar .inc file dependency introduced by copy-paste.
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index c7c07f5..62be13a 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -99,7 +99,7 @@
   ${CMAKE_CURRENT_SOURCE_DIR}/operand.cpp
   PROPERTIES OBJECT_DEPENDS "${OPERAND_CPP_DEPENDS}")
 set_source_files_properties(
-  ${CMAKE_CURRENT_SOURCE_DIR}/operand.cpp
+  ${CMAKE_CURRENT_SOURCE_DIR}/ext_inst.cpp
   PROPERTIES OBJECT_DEPENDS "${EXTINST_CPP_DEPENDS}")
 
 set(SPIRV_SOURCES