diff --git a/src/interfaces/ecpg/test/Makefile.regress b/src/interfaces/ecpg/test/Makefile.regress
index fd6e83aeafa..b3d7c1e874a 100644
--- a/src/interfaces/ecpg/test/Makefile.regress
+++ b/src/interfaces/ecpg/test/Makefile.regress
@@ -12,7 +12,7 @@ override LIBS := -lecpg -lpgtypes $(filter -l%, $(libpq)) $(LIBS) $(PTHREAD_LIBS
 ECPG = ../../preproc/ecpg --regression -I$(srcdir)/../../include -I$(srcdir)
 
 # Files that most or all ecpg preprocessor test outputs depend on
-ECPG_TEST_DEPENDENCIES = ../../preproc/ecpg \
+ECPG_TEST_DEPENDENCIES = ../../preproc/ecpg$(X) \
 	$(srcdir)/../regression.h \
 	$(srcdir)/../../include/sqlca.h \
 	$(srcdir)/../../include/sqlda.h \