diff --git a/libsrc/atari/shadow_ram_timerirq1.s b/libsrc/atari/shadow_ram_timerirq1.s
index f8a3e9b4d..e1b7d831b 100644
--- a/libsrc/atari/shadow_ram_timerirq1.s
+++ b/libsrc/atari/shadow_ram_timerirq1.s
@@ -11,6 +11,7 @@
 SHRAM_HANDLERS  =       1
                 .include        "atari.inc"
                 .include        "romswitch.inc"
+                .import         __CHARGEN_START__
                 .export         set_VTIMR1_handler
 
 
diff --git a/libsrc/atari/shadow_ram_timerirq2.s b/libsrc/atari/shadow_ram_timerirq2.s
index b2cdaecd2..d6d581937 100644
--- a/libsrc/atari/shadow_ram_timerirq2.s
+++ b/libsrc/atari/shadow_ram_timerirq2.s
@@ -11,6 +11,7 @@
 SHRAM_HANDLERS  =       1
                 .include        "atari.inc"
                 .include        "romswitch.inc"
+                .import         __CHARGEN_START__
                 .export         set_VTIMR2_handler