diff --git a/core/config.mk b/core/config.mk
index 49810ee..e615159 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -540,6 +540,10 @@
 ZIPTIME := $(HOST_OUT_EXECUTABLES)/ziptime$(HOST_EXECUTABLE_SUFFIX)
 endif
 
+# ijar converts a .jar file to a smaller .jar file which only has its
+# interfaces.
+IJAR := $(HOST_OUT_EXECUTABLES)/ijar$(BUILD_EXECUTABLE_SUFFIX)
+
 # relocation packer
 RELOCATION_PACKER := prebuilts/misc/$(BUILD_OS)-$(HOST_PREBUILT_ARCH)/relocation_packer/relocation_packer