diff --git a/gnu/usr.bin/cc/cccp/Makefile b/gnu/usr.bin/cc/cccp/Makefile
index 8401a112933..1b4045f5ffc 100644
--- a/gnu/usr.bin/cc/cccp/Makefile
+++ b/gnu/usr.bin/cc/cccp/Makefile
@@ -11,6 +11,4 @@ BINDIR=	/usr/libexec
 MAN1=	cccp.1
 MLINKS=	cccp.1 cpp.1
 
-CFLAGS+= -DPREFIX=\"/usr\"
-
 .include <bsd.prog.mk>
diff --git a/gnu/usr.bin/cc/cpp/Makefile b/gnu/usr.bin/cc/cpp/Makefile
index 8401a112933..1b4045f5ffc 100644
--- a/gnu/usr.bin/cc/cpp/Makefile
+++ b/gnu/usr.bin/cc/cpp/Makefile
@@ -11,6 +11,4 @@ BINDIR=	/usr/libexec
 MAN1=	cccp.1
 MLINKS=	cccp.1 cpp.1
 
-CFLAGS+= -DPREFIX=\"/usr\"
-
 .include <bsd.prog.mk>