diff --git a/package/libmodsecurity/Config.in b/package/libmodsecurity/Config.in
index 87f7a9c103..f65ab3de93 100644
--- a/package/libmodsecurity/Config.in
+++ b/package/libmodsecurity/Config.in
@@ -2,6 +2,8 @@ config BR2_PACKAGE_LIBMODSECURITY
 	bool "libmodsecurity"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	# libmodsecurity embeds several mbedtls source files
+	depends on !(BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS)
 	select BR2_PACKAGE_PCRE
 	help
 	  Libmodsecurity is one component of the ModSecurity
@@ -17,3 +19,6 @@ config BR2_PACKAGE_LIBMODSECURITY
 
 comment "libmodsecurity needs a toolchain w/ C++, threads"
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+
+comment "libmodsecurity needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS
diff --git a/package/nginx-modsecurity/Config.in b/package/nginx-modsecurity/Config.in
index b1fcbadd7a..5cbe57a866 100644
--- a/package/nginx-modsecurity/Config.in
+++ b/package/nginx-modsecurity/Config.in
@@ -3,6 +3,7 @@ config BR2_PACKAGE_NGINX_MODSECURITY
 	depends on BR2_PACKAGE_NGINX_HTTP
 	depends on BR2_INSTALL_LIBSTDCPP # libmodsecurity
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libmodsecurity
+	depends on !(BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS) # libmodsecurity
 	select BR2_PACKAGE_LIBMODSECURITY
 	help
 	  The ModSecurity-nginx connector is the connection
@@ -14,3 +15,7 @@ config BR2_PACKAGE_NGINX_MODSECURITY
 comment "nginx-modsecurity needs a toolchain w/ C++, threads"
 	depends on BR2_PACKAGE_NGINX_HTTP
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+
+comment "nginx-modsecurity needs a toolchain w/ dynamic library"
+	depends on BR2_PACKAGE_NGINX_HTTP
+	depends on BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS