diff --git a/icu4c/source/icudefs.mk.in b/icu4c/source/icudefs.mk.in
index 41784c2a075..f6f65c624a6 100644
--- a/icu4c/source/icudefs.mk.in
+++ b/icu4c/source/icudefs.mk.in
@@ -32,6 +32,8 @@ sysconfdir = @sysconfdir@
 PACKAGE = @PACKAGE@
 VERSION = @VERSION@
 UNICODE_VERSION = @UNICODE_VERSION@
+SO_TARGET_VERSION = @LIB_VERSION@
+SO_TARGET_VERSION_MAJOR = @LIB_VERSION_MAJOR@
 
 # Should be the same as U_ICUDATA_NAME
 ICUDATA_NAME = icudt@LIB_VERSION_MAJOR@@ICUDATA_CHAR@