diff --git a/c/src/lib/libc/Makefile.in b/c/src/lib/libc/Makefile.in
index 45721e1df2..e1203966f7 100644
--- a/c/src/lib/libc/Makefile.in
+++ b/c/src/lib/libc/Makefile.in
@@ -54,7 +54,6 @@ H_FILES=$(srcdir)/libcsupport.h
 SYS_H_FILES=
 RTEMS_H_FILES=$(srcdir)/libio.h
 
-INSTALLED_H_FILES=$(srcdir)/libio.h $(srcdir)/libcsupport.h
 SRCS=$(C_FILES) $(H_FILES) $(SYS_H_FILES) $(RTEMS_H_FILES)
 OBJS=$(C_O_FILES)