diff --git a/liba/Makefile b/liba/Makefile
index 90e44fa81..ee0fe2d46 100644
--- a/liba/Makefile
+++ b/liba/Makefile
@@ -18,7 +18,6 @@ objs += $(addprefix liba/src/, \
 )
 
 objs += $(addprefix liba/src/external/openbsd/, \
-  a_atanf.o \
   e_acosf.o \
   e_acoshf.o \
   e_asinf.o \
@@ -37,6 +36,7 @@ objs += $(addprefix liba/src/external/openbsd/, \
   k_sinf.o \
   k_tanf.o \
   s_asinhf.o\
+  s_atanf.o \
   s_ceilf.o \
   s_copysignf.o \
   s_cosf.o \
diff --git a/liba/src/external/openbsd/a_atanf.c b/liba/src/external/openbsd/s_atanf.c
similarity index 100%
rename from liba/src/external/openbsd/a_atanf.c
rename to liba/src/external/openbsd/s_atanf.c