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-rw-r--r--src/frame.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/frame.h b/src/frame.h
index 1aba1e3bc47..b1ad525779c 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -920,6 +920,8 @@ default_pixels_per_inch_y (void)
/* Scale factor of frame F. */
#if defined HAVE_NS
# define FRAME_SCALE_FACTOR(f) (FRAME_NS_P (f) ? ns_frame_scale_factor (f) : 1)
+#elif defined HAVE_PGTK
+# define FRAME_SCALE_FACTOR(f) (FRAME_PGTK_P (f) ? pgtk_frame_scale_factor (f) : 1)
#else
# define FRAME_SCALE_FACTOR(f) 1
#endif