diff --git a/firmware/target/hosted/sdl/lcd-sdl.c b/firmware/target/hosted/sdl/lcd-sdl.c
index 57026eedfe..40ba94072b 100644
--- a/firmware/target/hosted/sdl/lcd-sdl.c
+++ b/firmware/target/hosted/sdl/lcd-sdl.c
@@ -24,7 +24,7 @@
 #include "sim-ui-defines.h"
 #include "system.h" /* for MIN() and MAX() */
 
-int display_zoom = 1;
+double display_zoom = 1;
 
 void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
                      int height, int max_x, int max_y,
diff --git a/firmware/target/hosted/sdl/system-sdl.c b/firmware/target/hosted/sdl/system-sdl.c
index 1e1968d66d..b03ed89d49 100644
--- a/firmware/target/hosted/sdl/system-sdl.c
+++ b/firmware/target/hosted/sdl/system-sdl.c
@@ -314,7 +314,7 @@ void sys_handle_argv(int argc, char *argv[])
             {
                 x++;
                 if(x < argc)
-                    display_zoom=atoi(argv[x]);
+                    display_zoom=atof(argv[x]);
                 else
                     display_zoom = 2;
                 printf("Window zoom is %d\n", display_zoom);
@@ -364,7 +364,7 @@ void sys_handle_argv(int argc, char *argv[])
             }
         }
     }
-    if (display_zoom > 1) {
+    if (display_zoom != 1) {
         background = false;
     }
 }
diff --git a/firmware/target/hosted/sdl/system-sdl.h b/firmware/target/hosted/sdl/system-sdl.h
index 979d556fdd..43ee0bdff1 100644
--- a/firmware/target/hosted/sdl/system-sdl.h
+++ b/firmware/target/hosted/sdl/system-sdl.h
@@ -59,7 +59,7 @@ void sim_do_exit(void) NORETURN_ATTR;
 
 extern bool background;  /* True if the background image is enabled */
 extern bool showremote;
-extern int display_zoom;
+extern double display_zoom;
 extern long start_tick;
 
 #endif /* _SYSTEM_SDL_H_ */