diff --git a/src/LLVM.zig b/src/LLVM.zig
index 8c89876..c7bb1b7 100644
--- a/src/LLVM.zig
+++ b/src/LLVM.zig
@@ -675,6 +675,9 @@ pub const Function = opaque {
     pub fn to_string(function: *Function) []const u8 {
         return api.llvm_function_to_string(function).to_slice();
     }
+
+    pub const set_calling_convention = api.LLVMSetFunctionCallConv;
+    pub const get_calling_convention = api.LLVMGetFunctionCallConv;
 };
 
 pub const Constant = opaque {
@@ -1005,6 +1008,50 @@ pub const ThreadLocalMode = enum(c_uint) {
     none = 0,
 };
 
+pub const CallingConvention = enum(c_uint) {
+    c = 0,
+    fast = 8,
+    cold = 9,
+    ghc = 10,
+    hipe = 11,
+    anyreg = 13,
+    preserve_most = 14,
+    preserve_all = 15,
+    swift = 16,
+    cxx_fast_tls = 17,
+    x86_stdcall = 64,
+    x86_fastcall = 65,
+    arm_apcs = 66,
+    arm_aapcs = 67,
+    arm_aapcsvfp = 68,
+    msp430_interrupt = 69,
+    x86_thiscall = 70,
+    ptx_kernel = 71,
+    ptx_device = 72,
+    spir_func = 75,
+    spir_kernel = 76,
+    intel_oclbi = 77,
+    x86_64_system_v = 78,
+    win64 = 79,
+    x86_vector = 80,
+    hhvm = 81,
+    hhvmc = 82,
+    x86_interrupt = 83,
+    avr_interrupt = 84,
+    avr_signal = 85,
+    avr_builtin = 86,
+    amdgpu_vs = 87,
+    amdgpu_gs = 88,
+    amdgpu_ps = 89,
+    amdgpu_cs = 90,
+    amdgpu_kernel = 91,
+    x86_regcall = 92,
+    amdgpu_hs = 93,
+    msp430_builtin = 94,
+    amgpu_ls = 95,
+    amdgpu_es = 96,
+};
+
 pub const lld = struct {
     pub const Result = extern struct {
         stdout: String,
diff --git a/src/converter.zig b/src/converter.zig
index 3a51098..fab8873 100644
--- a/src/converter.zig
+++ b/src/converter.zig
@@ -61,6 +61,13 @@ const FunctionKeyword = enum {
 const CallingConvention = enum {
     unknown,
     c,
+
+    pub fn to_llvm(calling_convention: CallingConvention) llvm.CallingConvention {
+        return switch (calling_convention) {
+            .unknown => .fast,
+            .c => .c,
+        };
+    }
 };
 
 const Variable = struct {
@@ -935,6 +942,7 @@ pub noinline fn convert(options: ConvertOptions) void {
                             },
                             .type = function_type,
                         });
+                        handle.set_calling_convention(calling_convention.to_llvm());
 
                         const entry_block = thread.context.create_basic_block("entry", handle);
                         thread.builder.position_at_end(entry_block);
diff --git a/src/llvm_api.zig b/src/llvm_api.zig
index 8fd9121..83b1e5c 100644
--- a/src/llvm_api.zig
+++ b/src/llvm_api.zig
@@ -14,6 +14,9 @@ pub extern fn llvm_context_create_basic_block(context: *llvm.Context, name: llvm
 
 pub extern fn LLVMGetBasicBlockTerminator(basic_block: *llvm.BasicBlock) ?*llvm.Value;
 
+pub extern fn LLVMSetFunctionCallConv(function: *llvm.Function, calling_convention: llvm.CallingConvention) void;
+pub extern fn LLVMGetFunctionCallConv(function: *llvm.Function) llvm.CallingConvention;
+
 pub extern fn llvm_function_to_string(function: *llvm.Function) *llvm.String;
 pub extern fn llvm_function_verify(function: *llvm.Function, error_message: *llvm.String) bool;
 pub extern fn llvm_module_verify(module: *llvm.Module, error_message: *llvm.String) bool;