diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index d590708..4685c5b 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -138,6 +138,13 @@ set_source_files_properties(bn_mod_exp.c PROPERTIES COMPILE_FLAGS
 target_link_libraries(bn_mod_exp ${OPENSSL_TEST_LIBS})
 add_test(bn_mod_exp bn_mod_exp)
 
+# bn_mod_exp_zero
+add_executable(bn_mod_exp_zero bn_mod_exp_zero.c)
+set_source_files_properties(bn_mod_exp_zero.c PROPERTIES COMPILE_FLAGS
+	-ULIBRESSL_INTERNAL)
+target_link_libraries(bn_mod_exp_zero ${OPENSSL_TEST_LIBS})
+add_test(bn_mod_exp_zero bn_mod_exp_zero)
+
 # bn_mod_exp2_mont
 add_executable(bn_mod_exp2_mont bn_mod_exp2_mont.c)
 target_link_libraries(bn_mod_exp2_mont ${OPENSSL_TEST_LIBS})
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3f655d3..6202bb3 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -149,6 +149,12 @@ check_PROGRAMS += bn_mod_exp
 bn_mod_exp_CPPFLAGS = $(AM_CPPFLAGS) -ULIBRESSL_INTERNAL
 bn_mod_exp_SOURCES = bn_mod_exp.c
 
+# bn_mod_exp_zero
+TESTS += bn_mod_exp_zero
+check_PROGRAMS += bn_mod_exp_zero
+bn_mod_exp_zero_CPPFLAGS = $(AM_CPPFLAGS) -ULIBRESSL_INTERNAL
+bn_mod_exp_zero_SOURCES = bn_mod_exp_zero.c
+
 # bn_mod_exp2_mont
 TESTS += bn_mod_exp2_mont
 check_PROGRAMS += bn_mod_exp2_mont