diff --git a/opcodes/i386-gen.c b/opcodes/i386-gen.c
index 053b66675c5..7ee8a30310c 100644
--- a/opcodes/i386-gen.c
+++ b/opcodes/i386-gen.c
@@ -30,7 +30,9 @@
 
 /* Build-time checks are preferrable over runtime ones.  Use this construct
    in preference where possible.  */
+#ifndef static_assert
 #define static_assert(e) ((void)sizeof (struct { int _:1 - 2 * !(e); }))
+#endif
 
 static const char *program_name = NULL;
 static int debug = 0;
diff --git a/opcodes/mips-formats.h b/opcodes/mips-formats.h
index 90df7100803..c4dec6352bf 100644
--- a/opcodes/mips-formats.h
+++ b/opcodes/mips-formats.h
@@ -49,7 +49,7 @@
 #define MAPPED_INT(SIZE, LSB, MAP, PRINT_HEX) \
   { \
     typedef char ATTRIBUTE_UNUSED \
-      static_assert[(1 << (SIZE)) == ARRAY_SIZE (MAP)]; \
+      static_assert_3[(1 << (SIZE)) == ARRAY_SIZE (MAP)]; \
     static const struct mips_mapped_int_operand op = { \
       { OP_MAPPED_INT, SIZE, LSB }, MAP, PRINT_HEX \
     }; \
@@ -83,7 +83,7 @@
 #define MAPPED_REG(SIZE, LSB, BANK, MAP) \
   { \
     typedef char ATTRIBUTE_UNUSED \
-      static_assert[(1 << (SIZE)) == ARRAY_SIZE (MAP)]; \
+      static_assert_4[(1 << (SIZE)) == ARRAY_SIZE (MAP)]; \
     static const struct mips_reg_operand op = { \
       { OP_REG, SIZE, LSB }, OP_REG_##BANK, MAP \
     }; \
@@ -93,7 +93,7 @@
 #define OPTIONAL_MAPPED_REG(SIZE, LSB, BANK, MAP) \
   { \
     typedef char ATTRIBUTE_UNUSED \
-      static_assert[(1 << (SIZE)) == ARRAY_SIZE (MAP)]; \
+      static_assert_5[(1 << (SIZE)) == ARRAY_SIZE (MAP)]; \
     static const struct mips_reg_operand op = { \
       { OP_OPTIONAL_REG, SIZE, LSB }, OP_REG_##BANK, MAP \
     }; \
diff --git a/opcodes/s390-opc.c b/opcodes/s390-opc.c
index 9d9f0973e55..49efd714157 100644
--- a/opcodes/s390-opc.c
+++ b/opcodes/s390-opc.c
@@ -36,7 +36,9 @@
 
 /* Build-time checks are preferrable over runtime ones.  Use this construct
    in preference where possible.  */
+#ifndef static_assert
 #define static_assert(e) ((void)sizeof (struct { int _:1 - 2 * !(e); }))
+#endif
 
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))