diff --git a/src/northsouthbridge/sis/550/ipl.S b/src/northsouthbridge/sis/550/ipl.S
index a8e72ae6d2..40896b3421 100644
--- a/src/northsouthbridge/sis/550/ipl.S
+++ b/src/northsouthbridge/sis/550/ipl.S
@@ -225,9 +225,9 @@ sis630ipl_start:
 #ifdef STD_FLASH
 #include "rom/std_flash.inc"
 #else /* !STD_FLASH */
-#if defined(USE_DOC_MIL) || defined(USE_DOC_2000_TSOP)
+#if (USE_DOC_MIL == 1) || (USE_DOC_2000_TSOP == 1)
 #	include "rom/doc_mil.inc"
-#else defined(USE_DOC_MIL_PLUS)
+#else (USE_DOC_MIL_PLUS == 1)
 #	include "rom/doc_mil_plus.inc"
 #endif
 #endif /* STD_FLASH */
@@ -353,9 +353,9 @@ reset_vector:
 	.byte	0xea				# jmp to f000:fe00, where IPL
 	.word	0xfe00, 0xf000			# starts in Standard Flash
 #else /* !STD_FLASH i.e. DoC Mil */
-#if defined(USE_DOC_MIL)
+#if (USE_DOC_MIL == 1)
 	.org 0x1f0
-#elif defined(USE_DOC_2000_TSOP) || defined(USE_DOC_MIL_PLUS)
+#elif (USE_DOC_2000_TSOP == 1) || (USE_DOC_MIL_PLUS == 1)
 	.org 0x3f0
 #endif
 reset_vector:
@@ -367,9 +367,9 @@ spl_vector:
 	.byte	0xea				# jmp to 8000:0000, where SPL
 	.word	0x0000, SPL_RAM_SEG		# (LinuxBIOS) starts in RAM
 
-#if defined(USE_DOC_MIL)
+#if (USE_DOC_MIL == 1)
 	.org 0x1ff
-#elif defined(USE_DOC_2000_TSOP) || defined(USE_DOC_MIL_PLUS)
+#elif (USE_DOC_2000_TSOP == 1) || (USE_DOC_MIL_PLUS == 1)
 	.org 0x3ff
 #endif
 
diff --git a/src/northsouthbridge/sis/550/ipl.h b/src/northsouthbridge/sis/550/ipl.h
index 76f747361c..642b0a9a06 100644
--- a/src/northsouthbridge/sis/550/ipl.h
+++ b/src/northsouthbridge/sis/550/ipl.h
@@ -10,7 +10,7 @@
 #define DOC_STACK_SEG		0x0400
 #define SPL_RAM_SEG		0x8000
 
-#if defined(USE_DOC_2000_TSOP)
+#if (USE_DOC_2000_TSOP == 1)
 #define DOC_SPL_START_PAGE	4	/* 0-3 for IPL (each of 1KB size) */
 #else /* defined (USE_DOC_MIL) */
 #define DOC_SPL_START_PAGE	2	/* 0,1 for IPL (each of 512B size) */
diff --git a/src/northsouthbridge/sis/630/ipl.S b/src/northsouthbridge/sis/630/ipl.S
index b27407f747..8cb83b6730 100644
--- a/src/northsouthbridge/sis/630/ipl.S
+++ b/src/northsouthbridge/sis/630/ipl.S
@@ -220,9 +220,9 @@ sis630ipl_start:
 #include "rom/std_flash.inc"
 #else /* !STD_FLASH */
 #include "unlock_flash.inc"
-#if defined(USE_DOC_MIL) || defined(USE_DOC_2000_TSOP)
+#if (USE_DOC_MIL == 1) || (USE_DOC_2000_TSOP == 1)
 #	include "rom/doc_mil.inc"
-#elif defined(USE_DOC_MIL_PLUS)
+#elif (USE_DOC_MIL_PLUS == 1)
 #	include "rom/doc_mil_plus.inc"
 #endif
 #endif /* STD_FLASH */
@@ -329,9 +329,9 @@ reset_vector:
 	.byte	0xea				# jmp to f000:fe00, where IPL
 	.word	0xfe00, 0xf000			# starts in Standard Flash
 #else /* !STD_FLASH i.e. DoC Mil */
-#if defined(USE_DOC_MIL)
+#if (USE_DOC_MIL == 1)
 	.org 0x1f0
-#elif defined(USE_DOC_2000_TSOP) || defined(USE_DOC_MIL_PLUS)
+#elif USE_DOC_2000_TSOP == 1) || (USE_DOC_MIL_PLUS == 1)
 	.org 0x3f0
 #endif
 reset_vector:
diff --git a/src/northsouthbridge/sis/630/ipl.h b/src/northsouthbridge/sis/630/ipl.h
index f676e85974..670e6b3d29 100644
--- a/src/northsouthbridge/sis/630/ipl.h
+++ b/src/northsouthbridge/sis/630/ipl.h
@@ -10,7 +10,7 @@
 #define DOC_STACK_SEG		0x0400
 #define SPL_RAM_SEG		0x8000
 
-#if defined(USE_DOC_2000_TSOP)
+#if (USE_DOC_2000_TSOP == 1)
 #define DOC_SPL_START_PAGE	4	/* 0-3 for IPL (each of 1KB size) */
 #else /* defined (USE_DOC_MIL) */
 #define DOC_SPL_START_PAGE	2	/* 0,1 for IPL (each of 512B size) */
diff --git a/util/config/sis550.config b/util/config/sis550.config
index 2d8759d760..21cf4f1b72 100644
--- a/util/config/sis550.config
+++ b/util/config/sis550.config
@@ -6,7 +6,7 @@ target sis550
 mainboard sis/550
 
 # use DOC MIL
-option USE_DOC_MIL
+option USE_DOC_MIL=1
 docipl northsouthbridge/sis/550/ipl.S
 
 # Use the internal VGA frame buffer device
diff --git a/util/config/winfast.config b/util/config/winfast.config
index 5fecc25476..c40efa338b 100644
--- a/util/config/winfast.config
+++ b/util/config/winfast.config
@@ -9,7 +9,7 @@ mainboard leadtek/winfast6300
 option SERIAL_CONSOLE=1
 
 # use DOC MIL
-option USE_DOC_MIL
+option USE_DOC_MIL=1
 docipl northsouthbridge/sis/630/ipl.S
 
 # Enable MicroCode update and L2 Cache init for PII and PIII