diff --git a/emu8051/src/common/instructions_8051.h b/emu8051/src/common/instructions_8051.h

index 2797733..5093d80 100644

--- a/emu8051/src/common/instructions_8051.h

+++ b/emu8051/src/common/instructions_8051.h

@@ -1049,7 +1049,7 @@ OPCODE_FP opcode_table[256] = {

 	cpu8051_OP_FF,

 };

 #else

-OPCODE_FP opcode_table[256];

+extern OPCODE_FP opcode_table[256];

 #endif

diff --git a/emu8051/src/common/options.h b/emu8051/src/common/options.h

index 22dd1bc..9db9d18 100644

--- a/emu8051/src/common/options.h

+++ b/emu8051/src/common/options.h

@@ -13,7 +13,7 @@

 #define PACKAGE_DESCRIPTION "Emulator for 8051 family microcontrollers"

-struct options_t {

+extern struct options_t {

 	int pram_size; /* Maximum program memory size. */

 	int iram_size; /* Maximum internal ram size. */

 	int xram_size; /* Maximum external ram size. */