diff --git a/0001-codegen-Add-function-prototypes-for-all-register-typ.patch b/0001-codegen-Add-function-prototypes-for-all-register-typ.patch
new file mode 100644
index 0000000..abd019d
--- /dev/null
+++ b/0001-codegen-Add-function-prototypes-for-all-register-typ.patch
@@ -0,0 +1,60 @@
+From b3e178b00ea77e2734f81262263e4ea1aab1e362 Mon Sep 17 00:00:00 2001
+From: Rico Tzschichholz <ricotz@ubuntu.com>
+Date: Thu, 1 Dec 2016 18:09:48 +0100
+Subject: [PATCH] codegen: Add function-prototypes for all register-type calls
+
+Make sure to match the list of called register-type calls and include
+implemented classes and interfaces.
+
+https://bugzilla.gnome.org/show_bug.cgi?id=775446
+---
+ codegen/valaccodemethodmodule.vala    | 6 ++++++
+ codegen/valatyperegisterfunction.vala | 8 ++++----
+ 2 files changed, 10 insertions(+), 4 deletions(-)
+
+diff --git a/codegen/valaccodemethodmodule.vala b/codegen/valaccodemethodmodule.vala
+index fc5ffc7..0f051f5 100644
+--- a/codegen/valaccodemethodmodule.vala
++++ b/codegen/valaccodemethodmodule.vala
+@@ -267,6 +267,12 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
+ 			}
+ 		}
+ 
++		// Add function prototypes for required register-type-calls which are likely external
++		var register_func = new CCodeFunction ("%s_register_type".printf (get_ccode_lower_case_name (type_symbol, null)), "GType");
++		register_func.add_parameter (new CCodeParameter ("module", "GTypeModule *"));
++		register_func.is_declaration = true;
++		cfile.add_function_declaration (register_func);
++
+ 		var register_call = new CCodeFunctionCall (new CCodeIdentifier ("%s_register_type".printf (get_ccode_lower_case_name (type_symbol, null))));
+ 		register_call.add_argument (new CCodeIdentifier (module_init_param_name));
+ 		ccode.add_expression (register_call);
+diff --git a/codegen/valatyperegisterfunction.vala b/codegen/valatyperegisterfunction.vala
+index b7c18f8..79ae1b3 100644
+--- a/codegen/valatyperegisterfunction.vala
++++ b/codegen/valatyperegisterfunction.vala
+@@ -80,6 +80,10 @@ public abstract class Vala.TypeRegisterFunction {
+ 				// avoid C warning as this function is not always used
+ 				fun.attributes += " G_GNUC_UNUSED";
+ 			}
++
++			fun.is_declaration = true;
++			declaration_fragment.append (fun.copy ());
++			fun.is_declaration = false;
+ 		} else {
+ 			fun = new CCodeFunction ("%s_register_type".printf (CCodeBaseModule.get_ccode_lower_case_name (get_type_declaration ())), "GType");
+ 			fun.add_parameter (new CCodeParameter ("module", "GTypeModule *"));
+@@ -252,10 +256,6 @@ public abstract class Vala.TypeRegisterFunction {
+ 			type_block.add_statement (new CCodeReturnStatement (new CCodeIdentifier (type_id_name)));
+ 		}
+ 
+-		fun.is_declaration = true;
+-		declaration_fragment.append (fun.copy ());
+-		fun.is_declaration = false;
+-
+ 		fun.block = type_block;
+ 
+ 		definition_fragment.append (fun);
+-- 
+2.9.3
+
diff --git a/vala.spec b/vala.spec
index 5e65616..57ba74c 100644
--- a/vala.spec
+++ b/vala.spec
@@ -3,13 +3,15 @@
 
 Name:           vala
 Version:        0.34.3
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A modern programming language for GNOME
 
 # Most files are LGPLv2.1+, curses.vapi is 2-clause BSD
 License:        LGPLv2+ and BSD
 URL:            https://wiki.gnome.org/Projects/Vala
 Source0:        https://download.gnome.org/sources/vala/0.34/vala-%{version}.tar.xz
+# https://bugzilla.gnome.org/show_bug.cgi?id=775446
+Patch0:         0001-codegen-Add-function-prototypes-for-all-register-typ.patch
 
 BuildRequires:  flex
 BuildRequires:  bison
@@ -86,6 +88,7 @@ This package contains documentation in a devhelp HTML book.
 
 %prep
 %setup -q
+%patch0 -p1
 
 
 %build
@@ -181,6 +184,9 @@ done
 
 
 %changelog
+* Thu Dec 01 2016 Kalev Lember <klember@redhat.com> - 0.34.3-2
+- codegen: Add function-prototypes for all register-type calls
+
 * Tue Nov 22 2016 Kalev Lember <klember@redhat.com> - 0.34.3-1
 - Update to 0.34.3