diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index 29d258aa5..4267e0e13 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -347,10 +347,13 @@ _hb_coretext_shaper_font_data_create (hb_font_t *font)
       hb_ot_var_axis_info_t info;
       unsigned int c = 1;
       hb_ot_var_get_axis_infos (font->face, i, &c, &info);
-      CFDictionarySetValue (variations,
-	CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &info.tag),
-	CFNumberCreate (kCFAllocatorDefault, kCFNumberFloatType, &font->design_coords[i])
-      );
+      float v = hb_clamp (font->design_coords[i], info.min_value, info.max_value);
+
+      CFNumberRef tag_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &info.tag);
+      CFNumberRef value_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberFloatType, &v);
+      CFDictionarySetValue (variations, tag_number, value_number);
+      CFRelease (tag_number);
+      CFRelease (value_number);
     }
 
     CFDictionaryRef attributes =