diff --git a/build/unix/elfhack/Makefile.in b/build/unix/elfhack/Makefile.in
index 41b16d9ffd2..17a389b7e24 100644
--- a/build/unix/elfhack/Makefile.in
+++ b/build/unix/elfhack/Makefile.in
@@ -58,8 +58,12 @@ OS_CXXFLAGS := $(filter-out -fno-exceptions,$(OS_CXXFLAGS)) -fexceptions
 ifneq (,$(filter %86,$(TARGET_CPU)))
 CPU := x86
 else
+ifneq (,$(filter arm%,$(TARGET_CPU)))
+CPU := arm
+else
 CPU := $(TARGET_CPU)
 endif
+endif
 
 CSRCS := \
   inject/$(CPU).c \