diff --git a/toolchain/gcc/common.mk b/toolchain/gcc/common.mk
index 5f237e4520..090aa2447d 100644
--- a/toolchain/gcc/common.mk
+++ b/toolchain/gcc/common.mk
@@ -74,9 +74,6 @@ TAR_OPTIONS += \
 	--exclude=libjava
 
 export libgcc_cv_fixed_point=no
-ifdef CONFIG_USE_UCLIBC
-  export glibcxx_cv_c99_math_tr1=no
-endif
 ifdef CONFIG_INSTALL_GCCGO
   export libgo_cv_c_split_stack_supported=no
 endif