diff --git a/drivers/lcd/ssd1289_lld.c b/drivers/lcd/ssd1289_lld.c
index 09769a4b..04d69a2a 100644
--- a/drivers/lcd/ssd1289_lld.c
+++ b/drivers/lcd/ssd1289_lld.c
@@ -417,7 +417,7 @@ uint16_t lld_lcdGetWidth(void) {
 }
 
 /* a positive lines value shifts the screen up, negative down */
-void lld_lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t lines) {
+void lld_lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int16_t lines) {
 	uint16_t row0, row1;
 	uint16_t i;
 
diff --git a/drivers/lcd/ssd1289_lld.h b/drivers/lcd/ssd1289_lld.h
index bea4bedf..16a9ef0d 100644
--- a/drivers/lcd/ssd1289_lld.h
+++ b/drivers/lcd/ssd1289_lld.h
@@ -24,7 +24,7 @@ uint16_t lld_lcdGetPixelColor(uint16_t x, uint16_t y);
 uint16_t lld_lcdGetOrientation(void);
 uint16_t lld_lcdGetHeight(void);
 uint16_t lld_lcdGetWidth(void);
-void lld_lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t lines);
+void lld_lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int16_t lines);
 
 #ifdef __cplusplus
 }
diff --git a/glcd/glcd.c b/glcd/glcd.c
index 6c3a830b..58220559 100644
--- a/glcd/glcd.c
+++ b/glcd/glcd.c
@@ -253,7 +253,7 @@ glcd_result_t lcdWriteStream(uint16_t *buffer, uint16_t size) {
 	return (glcd_result_t)chMsgSend(workerThread, (msg_t)&msg);
 }
 
-glcd_result_t lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t lines) {
+glcd_result_t lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int16_t lines) {
 	struct glcd_msg_vertical_scroll msg;
 
 	msg.action = GLCD_VERTICAL_SCROLL;
diff --git a/glcd/glcd.h b/glcd/glcd.h
index 4ae26233..4048fbe8 100644
--- a/glcd/glcd.h
+++ b/glcd/glcd.h
@@ -89,7 +89,7 @@ uint16_t lcdBGR2RGB(uint16_t color);
 uint16_t lcdGetPixelColor(uint16_t x, uint16_t y);
 
 /* Scrolling function */
-glcd_result_t lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t lines);
+glcd_result_t lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int16_t lines);
 
 #ifdef __cplusplus
 }