diff --git a/configs/stm32f4discovery/winbuild/Make.defs b/configs/stm32f4discovery/winbuild/Make.defs
index 426611f8e56..bb78f35aa45 100644
--- a/configs/stm32f4discovery/winbuild/Make.defs
+++ b/configs/stm32f4discovery/winbuild/Make.defs
@@ -135,3 +135,5 @@ HOSTCC = mingw-gcc.exe
 HOSTINCLUDES = -I.
 HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -g -pipe
 HOSTLDFLAGS =
+HOSTEXEEXT = .exe
+