diff --git a/dll/win32/dbghelp/CMakeLists.txt b/dll/win32/dbghelp/CMakeLists.txt
index efa5c00726d..ffb43a4eb64 100644
--- a/dll/win32/dbghelp/CMakeLists.txt
+++ b/dll/win32/dbghelp/CMakeLists.txt
@@ -5,6 +5,7 @@ add_definitions(
     -D__USE_CRTIMP
     -D_WINE
     -DHAVE_REGEX_H
+    -DHAVE_ALLOCA_H
     -D_IMAGEHLP_SOURCE_)
 
 if(ARCH MATCHES amd64)