diff --git a/package/clamav/Config.in b/package/clamav/Config.in
index 839518ebd6..92cd75cf70 100644
--- a/package/clamav/Config.in
+++ b/package/clamav/Config.in
@@ -6,6 +6,7 @@ config BR2_PACKAGE_CLAMAV
 	depends on BR2_USE_MMU # fork()
 	depends on !BR2_STATIC_LIBS # dlopen
 	depends on BR2_USE_WCHAR
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 # json-c
 	select BR2_PACKAGE_BZIP2
 	select BR2_PACKAGE_HOST_RUSTC
 	select BR2_PACKAGE_JSON_C
@@ -29,3 +30,4 @@ comment "clamav needs a toolchain w/ C++, dynamic library, threads, wchar"
 		|| !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR
 	depends on BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS
 	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4