diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f7c6a1..fd755ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -292,6 +292,7 @@ if(CMAKE_SYSTEM_NAME MATCHES "Linux")
 	if (HAVE_CLOCK_GETTIME)
 		set(OPENSSL_LIBS ${OPENSSL_LIBS} rt)
 	endif()
+	set(OPENSSL_LIBS ${OPENSSL_LIBS} pthread)
 endif()
 if(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
 	set(OPENSSL_LIBS ${OPENSSL_LIBS} pthread)
diff --git a/m4/check-os-options.m4 b/m4/check-os-options.m4
index 761a51d..3cf1956 100644
--- a/m4/check-os-options.m4
+++ b/m4/check-os-options.m4
@@ -80,6 +80,7 @@ char buf[1]; getentropy(buf, 1);
 		HOST_OS=linux
 		HOST_ABI=elf
 		CPPFLAGS="$CPPFLAGS -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_SOURCE -D_GNU_SOURCE"
+		AC_SUBST([PLATFORM_LDADD], ['-lpthread'])
 		;;
 	*netbsd*)
 		HOST_OS=netbsd