diff --git a/arch/mips/tx4927/common/Makefile b/arch/mips/tx4927/common/Makefile
index 9cb9535ebacba6e9ad6b3c65113cde36b25444e8..18375787e094380a152d0d2634f74d7eb377817e 100644
--- a/arch/mips/tx4927/common/Makefile
+++ b/arch/mips/tx4927/common/Makefile
@@ -10,3 +10,5 @@ obj-y	+= tx4927_prom.o tx4927_setup.o tx4927_irq.o
 
 obj-$(CONFIG_TOSHIBA_FPCIB0)	   += smsc_fdc37m81x.o
 obj-$(CONFIG_KGDB)                 += tx4927_dbgio.o
+
+EXTRA_CFLAGS += -Werror
diff --git a/arch/mips/tx4927/toshiba_rbtx4927/Makefile b/arch/mips/tx4927/toshiba_rbtx4927/Makefile
index 8a991f3c1a6f88c1189bac38104a3e2b98952520..13f96725d7727aad0b6c00f992c92cc89db354ea 100644
--- a/arch/mips/tx4927/toshiba_rbtx4927/Makefile
+++ b/arch/mips/tx4927/toshiba_rbtx4927/Makefile
@@ -1,3 +1,5 @@
 obj-y	+= toshiba_rbtx4927_prom.o
 obj-y	+= toshiba_rbtx4927_setup.o
 obj-y	+= toshiba_rbtx4927_irq.o
+
+EXTRA_CFLAGS += -Werror
diff --git a/arch/mips/tx4938/common/Makefile b/arch/mips/tx4938/common/Makefile
index 83cda518f20401e0295fe83c70c5a9b2d495475c..8352eca679066c34f7d85667ad1cb7dc0b3e3119 100644
--- a/arch/mips/tx4938/common/Makefile
+++ b/arch/mips/tx4938/common/Makefile
@@ -9,3 +9,4 @@
 obj-y	+= prom.o setup.o irq.o
 obj-$(CONFIG_KGDB) += dbgio.o
 
+EXTRA_CFLAGS += -Werror
diff --git a/arch/mips/tx4938/toshiba_rbtx4938/Makefile b/arch/mips/tx4938/toshiba_rbtx4938/Makefile
index 10c94e62bf5be355c9832e76855e473a5f2291b5..675bb1c3e40c72cc4776b906c05dd2abb8840904 100644
--- a/arch/mips/tx4938/toshiba_rbtx4938/Makefile
+++ b/arch/mips/tx4938/toshiba_rbtx4938/Makefile
@@ -7,3 +7,5 @@
 #
 
 obj-y	+= prom.o setup.o irq.o spi_eeprom.o
+
+EXTRA_CFLAGS += -Werror