diff --git a/core/Makefile b/core/Makefile
index f5d23b4..afb2a48 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -576,12 +576,13 @@
 
 # $(1): src directory
 # $(2): output file
-# $(3): label (if any)
+# $(3): label
 # $(4): ext variant (ext2, ext3, ext4)
+# $(5): size of the partition
 define build-userimage-ext-target
   @mkdir -p $(dir $(2))
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$(PATH) \
-	  $(MKEXT2USERIMG) $(1) $(2) $(4) $(3)
+	  $(MKEXT2USERIMG) $(1) $(2) $(4) $(3) $(5)
 endef
 else
 INTERNAL_USERIMAGES_DEPS := $(MKYAFFS2)
@@ -705,7 +706,7 @@
 # $(1): output file
 define build-systemimage-target
     @echo "Target system fs image: $(1)"
-    $(call build-userimage-ext-target,$(TARGET_OUT),$(1),system,$(INTERNAL_USERIMAGES_EXT_VARIANT))
+    $(call build-userimage-ext-target,$(TARGET_OUT),$(1),system,$(INTERNAL_USERIMAGES_EXT_VARIANT),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
 endef
 
 else # INTERNAL_USERIMAGES_USE_EXT != true
@@ -838,7 +839,7 @@
 define build-userdataimage-target
     $(call pretty,"Target userdata fs image: $(INSTALLED_USERDATAIMAGE_TARGET)")
     @mkdir -p $(TARGET_OUT_DATA)
-    $(call build-userimage-ext-target,$(TARGET_OUT_DATA),$(INSTALLED_USERDATAIMAGE_TARGET),userdata,$(INTERNAL_USERIMAGES_EXT_VARIANT))
+    $(call build-userimage-ext-target,$(TARGET_OUT_DATA),$(INSTALLED_USERDATAIMAGE_TARGET),userdata,$(INTERNAL_USERIMAGES_EXT_VARIANT),$(BOARD_USERDATAIMAGE_PARTITION_SIZE))
     $(hide) $(call assert-max-image-size,$(INSTALLED_USERDATAIMAGE_TARGET),$(BOARD_USERDATAIMAGE_PARTITION_SIZE),yaffs)
 endef