diff --git a/src/add-ons/accelerants/neomagic/engine/nm_info.c b/src/add-ons/accelerants/neomagic/engine/nm_info.c
index b2687cf3f7..21f81a1fe2 100644
--- a/src/add-ons/accelerants/neomagic/engine/nm_info.c
+++ b/src/add-ons/accelerants/neomagic/engine/nm_info.c
@@ -7,7 +7,7 @@
 
 #include "nm_std.h"
 
-void set_nm2070(void)
+static void set_nm2070(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -27,7 +27,7 @@ void set_nm2070(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2090_nm2093(void)
+static void set_nm2090_nm2093(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -46,7 +46,7 @@ void set_nm2090_nm2093(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2097(void)
+static void set_nm2097(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -65,7 +65,7 @@ void set_nm2097(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2160(void)
+static void set_nm2160(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -84,7 +84,7 @@ void set_nm2160(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2200(void)
+static void set_nm2200(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -103,7 +103,7 @@ void set_nm2200(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2230(void)
+static void set_nm2230(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -122,7 +122,7 @@ void set_nm2230(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2360(void)
+static void set_nm2360(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
@@ -141,7 +141,7 @@ void set_nm2360(void)
 	si->ps.std_engine_clock = 0;
 }
 
-void set_nm2380(void)
+static void set_nm2380(void)
 {
 	/* setup cardspecs */
 	si->ps.f_ref = 14.31818;
diff --git a/src/add-ons/kernel/drivers/graphics/matrox/driver.c b/src/add-ons/kernel/drivers/graphics/matrox/driver.c
index 9d6f585f17..2f64c3ed06 100644
--- a/src/add-ons/kernel/drivers/graphics/matrox/driver.c
+++ b/src/add-ons/kernel/drivers/graphics/matrox/driver.c
@@ -137,23 +137,23 @@ static void dumprom (void *rom, size_t size)
 }
 
 /*return 1, is interrupt has occured*/
-int caused_vbi(vuint32 * regs)
+static int caused_vbi(vuint32 * regs)
 {
 	return (ACCR(STATUS)&0x20);
 }
 
 /*clear the interrupt*/
-void clear_vbi(vuint32 * regs)
+static void clear_vbi(vuint32 * regs)
 {
 	ACCW(ICLEAR,0x20);
 }
 
-void enable_vbi(vuint32 * regs)
+static void enable_vbi(vuint32 * regs)
 {
 	ACCW(IEN,ACCR(IEN)|0x20);
 }
 
-void disable_vbi(vuint32 * regs)
+static void disable_vbi(vuint32 * regs)
 {
 	ACCW(IEN,(ACCR(IEN)&~0x20));
 	ACCW(ICLEAR,0x20);
diff --git a/src/add-ons/kernel/drivers/graphics/neomagic/driver.c b/src/add-ons/kernel/drivers/graphics/neomagic/driver.c
index 5cd189c625..d3a83e844b 100644
--- a/src/add-ons/kernel/drivers/graphics/neomagic/driver.c
+++ b/src/add-ons/kernel/drivers/graphics/neomagic/driver.c
@@ -142,24 +142,24 @@ static void dumprom (void *rom, size_t size)
 }
 
 /*return 1, is interrupt has occured*/
-int caused_vbi(vuint32 * regs, vuint32 * regs2)
+static int caused_vbi(vuint32 * regs, vuint32 * regs2)
 {
 //	return (ACCR(STATUS)&0x20);
 return 0;
 }
 
 /*clear the interrupt*/
-void clear_vbi(vuint32 * regs, vuint32 * regs2)
+static void clear_vbi(vuint32 * regs, vuint32 * regs2)
 {
 //	ACCW(ICLEAR,0x20);
 }
 
-void enable_vbi(vuint32 * regs, vuint32 * regs2)
+static void enable_vbi(vuint32 * regs, vuint32 * regs2)
 {
 //	ACCW(IEN,ACCR(IEN)|0x20);
 }
 
-void disable_vbi(vuint32 * regs, vuint32 * regs2)
+static void disable_vbi(vuint32 * regs, vuint32 * regs2)
 {
 //	ACCW(IEN,(ACCR(IEN)&~0x20));
 //	ACCW(ICLEAR,0x20);
diff --git a/src/add-ons/kernel/drivers/graphics/nvidia/driver.c b/src/add-ons/kernel/drivers/graphics/nvidia/driver.c
index 74914c0bc4..7a10affdd1 100644
--- a/src/add-ons/kernel/drivers/graphics/nvidia/driver.c
+++ b/src/add-ons/kernel/drivers/graphics/nvidia/driver.c
@@ -244,18 +244,18 @@ static void dumprom (void *rom, size_t size)
 }
 
 /* return 1 if vblank interrupt has occured */
-int caused_vbi(vuint32 * regs)
+static int caused_vbi(vuint32 * regs)
 {
 	return (NV_REG32(NV32_CRTC_INTS) & 0x00000001);
 }
 
 /* clear the vblank interrupt */
-void clear_vbi(vuint32 * regs)
+static void clear_vbi(vuint32 * regs)
 {
 	NV_REG32(NV32_CRTC_INTS) = 0x00000001;
 }
 
-void enable_vbi(vuint32 * regs)
+static void enable_vbi(vuint32 * regs)
 {
 	/* clear the vblank interrupt */
 	NV_REG32(NV32_CRTC_INTS) = 0x00000001;
@@ -265,7 +265,7 @@ void enable_vbi(vuint32 * regs)
 	NV_REG32(NV32_MAIN_INTE) = 0x00000001;
 }
 
-void disable_vbi(vuint32 * regs)
+static void disable_vbi(vuint32 * regs)
 {
 	/* disable nVidia interrupt source vblank */
 	NV_REG32(NV32_CRTC_INTE) &= 0xfffffffe;