diff --git a/src/compiler/llvm_codegen.c b/src/compiler/llvm_codegen.c
index 9aa8e2fab..715426adc 100644
--- a/src/compiler/llvm_codegen.c
+++ b/src/compiler/llvm_codegen.c
@@ -2,8 +2,10 @@
 // Use of this source code is governed by the GNU LGPLv3.0 license
 // a copy of which can be found in the LICENSE file.
 
-#include <llvm-c/Error.h>
 #include "llvm_codegen_internal.h"
+
+#if LLVM_VERSION_MAJOR > 12
+#include <llvm-c/Error.h>
 typedef struct LLVMOpaquePassBuilderOptions *LLVMPassBuilderOptionsRef;
 LLVMErrorRef LLVMRunPasses(LLVMModuleRef M, const char *Passes,
                            LLVMTargetMachineRef TM,
@@ -12,6 +14,7 @@ LLVMPassBuilderOptionsRef LLVMCreatePassBuilderOptions(void);
 void LLVMPassBuilderOptionsSetVerifyEach(LLVMPassBuilderOptionsRef Options, LLVMBool VerifyEach);
 void LLVMPassBuilderOptionsSetDebugLogging(LLVMPassBuilderOptionsRef Options, LLVMBool DebugLogging);
 void LLVMDisposePassBuilderOptions(LLVMPassBuilderOptionsRef Options);
+#endif
 
 const char* llvm_version = LLVM_VERSION_STRING;
 const char* llvm_target = LLVM_DEFAULT_TARGET_TRIPLE;
@@ -847,7 +850,7 @@ static inline void llvm_opt_old(GenContext *c)
 	LLVMRunPassManager(pass_manager, c->module);
 	LLVMDisposePassManager(pass_manager);
 }
-
+#if LLVM_VERSION_MAJOR > 12
 static inline void llvm_opt_new(GenContext *c)
 {
 	LLVMPassBuilderOptionsRef options = LLVMCreatePassBuilderOptions();
@@ -887,14 +890,17 @@ static inline void llvm_opt_new(GenContext *c)
 	}
 	LLVMDisposePassBuilderOptions(options);
 }
+#endif
 const char *llvm_codegen(void *context)
 {
 	GenContext *c = context;
+#if LLVM_VERSION_MAJOR > 12
 	if (active_target.use_new_optimizer)
 	{
 		llvm_opt_new(c);
 	}
 	else
+#endif
 	{
 		llvm_opt_old(c);
 	}