diff --git a/libsrc/osic1p/osic1p.inc b/libsrc/osic1p/osic1p.inc
index d209b258d..232c471aa 100644
--- a/libsrc/osic1p/osic1p.inc
+++ b/libsrc/osic1p/osic1p.inc
@@ -7,4 +7,4 @@ KBD             := $DF00        ; Polled keyboard register
 ; Other definitions
 VIDEORAMSIZE    = $0400         ; Size of C1P video RAM (1 kB)
 SCR_WIDTH       = $18           ; Screen width
-SCR_HEIGHT      = $19           ; Screen height
+SCR_HEIGHT      = $18           ; Screen height