diff --git a/src/cckohn/GNUmakefile b/src/cckohn/GNUmakefile
index 6cebc52131..2a67deee47 100644
--- a/src/cckohn/GNUmakefile
+++ b/src/cckohn/GNUmakefile
@@ -7,7 +7,7 @@ OBJ = cckohn.o cckohn_input.o cknew.o obftrans.o hbftrans.o \
 	bforthog.o fforth1.o fforth2.o denom.o top.o
 OBJ_OPTIMIZE = 
 
-USES_BLAS = 
+USES_BLAS = cknew.F
 
 SUBDIRS = bessel
 
diff --git a/src/cckohn/bessel/GNUmakefile b/src/cckohn/bessel/GNUmakefile
index 8507a7efa3..b5a4f26511 100644
--- a/src/cckohn/bessel/GNUmakefile
+++ b/src/cckohn/bessel/GNUmakefile
@@ -9,7 +9,7 @@ OBJ_OPTIMIZE =
 
 LIBRARY = libcckohn.a
 
-USES_BLAS = 
+USES_BLAS = ubesplg.F
 
 include ../../config/makefile.h
 include ../../config/makelib.h