diff --git a/0001-Do-not-build-the-Ruby-plugin.patch b/0001-Do-not-build-the-Ruby-plugin.patch
new file mode 100644
index 0000000..399816d
--- /dev/null
+++ b/0001-Do-not-build-the-Ruby-plugin.patch
@@ -0,0 +1,43 @@
+From ad0cae3d6eb5a47e8ec0a52b78013e658aa1720b Mon Sep 17 00:00:00 2001
+From: Mathieu Bridon <bochecha@daitauha.fr>
+Date: Mon, 17 Dec 2018 11:41:34 +0100
+Subject: [PATCH] Do not build the Ruby plugin
+
+Unfortunately, this can't build without protobuf 3.6, so we must disable
+it for Fedora 28 and 29 which only have protobuf 3.5.
+---
+ Makefile | 4 +---
+ 1 file changed, 1 insertion(+), 3 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index 066c191..09ad70a 100644
+--- a/Makefile
++++ b/Makefile
+@@ -802,7 +802,7 @@ PC_LIBS_GRPCXX =
+ 
+ CPPFLAGS := -Ithird_party/googletest/googletest/include -Ithird_party/googletest/googlemock/include $(CPPFLAGS)
+ 
+-PROTOC_PLUGINS_ALL = $(BINDIR)/$(CONFIG)/grpc_cpp_plugin $(BINDIR)/$(CONFIG)/grpc_csharp_plugin $(BINDIR)/$(CONFIG)/grpc_node_plugin $(BINDIR)/$(CONFIG)/grpc_objective_c_plugin $(BINDIR)/$(CONFIG)/grpc_php_plugin $(BINDIR)/$(CONFIG)/grpc_python_plugin $(BINDIR)/$(CONFIG)/grpc_ruby_plugin
++PROTOC_PLUGINS_ALL = $(BINDIR)/$(CONFIG)/grpc_cpp_plugin $(BINDIR)/$(CONFIG)/grpc_csharp_plugin $(BINDIR)/$(CONFIG)/grpc_node_plugin $(BINDIR)/$(CONFIG)/grpc_objective_c_plugin $(BINDIR)/$(CONFIG)/grpc_php_plugin $(BINDIR)/$(CONFIG)/grpc_python_plugin
+ PROTOC_PLUGINS_DIR = $(BINDIR)/$(CONFIG)
+ 
+ ifeq ($(HAS_SYSTEM_PROTOBUF),true)
+@@ -3151,7 +3151,6 @@ install-plugins: $(PROTOC_PLUGINS)
+ 	$(Q) $(INSTALL) -d $(prefix)/bin
+ 	$(Q) $(INSTALL) $(BINDIR)/$(CONFIG)/grpc_python_plugin $(prefix)/bin/grpc_python_plugin
+ 	$(Q) $(INSTALL) -d $(prefix)/bin
+-	$(Q) $(INSTALL) $(BINDIR)/$(CONFIG)/grpc_ruby_plugin $(prefix)/bin/grpc_ruby_plugin
+ 
+ install-grpc-cli: grpc_cli
+ 	$(E) "[INSTALL] Installing grpc cli"
+@@ -7162,7 +7161,6 @@ LIBGRPC_PLUGIN_SUPPORT_SRC = \
+     src/compiler/objective_c_generator.cc \
+     src/compiler/php_generator.cc \
+     src/compiler/python_generator.cc \
+-    src/compiler/ruby_generator.cc \
+ 
+ PUBLIC_HEADERS_CXX += \
+     include/grpc++/impl/codegen/config_protobuf.h \
+-- 
+2.17.2
+
diff --git a/grpc.spec b/grpc.spec
index d683e9b..e975a4d 100644
--- a/grpc.spec
+++ b/grpc.spec
@@ -25,6 +25,10 @@ Patch0: 0001-enforce-system-crypto-policies.patch
 # https://github.com/grpc/grpc/pull/15532
 Patch1: 0002-patch-from-15532.patch
 
+%if 0%{?fedora} < 30
+Patch2: 0001-Do-not-build-the-Ruby-plugin.patch
+%endif
+
 %description
 gRPC is a modern open source high performance RPC framework that can run in any
 environment. It can efficiently connect services in and across data centers