diff --git a/Externals/imgui/CMakeLists.txt b/Externals/imgui/CMakeLists.txt
index 5a1a83656379..77524c08ff02 100644
--- a/Externals/imgui/CMakeLists.txt
+++ b/Externals/imgui/CMakeLists.txt
@@ -10,6 +10,7 @@ set(SRCS
   imgui_draw.cpp
   imgui_tables.cpp
   imgui_widgets.cpp
+  misc/cpp/imgui_stdlib.cpp
 )
 
 add_library(imgui STATIC ${SRCS})