diff --git a/common/grammar-parser.cpp b/common/grammar-parser.cpp
index e05d0f8aa..5a545a807 100644
--- a/common/grammar-parser.cpp
+++ b/common/grammar-parser.cpp
@@ -9,7 +9,7 @@
 namespace grammar_parser {
     // NOTE: assumes valid utf8 (but checks for overrun)
     // copied from llama.cpp
-    static auto decode_utf8(const char * src) -> std::pair<uint32_t, const char *> {
+    static std::pair<uint32_t, const char *> decode_utf8(const char * src) {
         static const int lookup[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4 };
         uint8_t  first_byte = static_cast<uint8_t>(*src);
         uint8_t  highbits   = first_byte >> 4;
@@ -50,7 +50,7 @@ namespace grammar_parser {
         return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || c == '-' || ('0' <= c && c <= '9');
     }
 
-    static auto parse_hex(const char * src, int size) -> std::pair<uint32_t, const char *> {
+    static std::pair<uint32_t, const char *> parse_hex(const char * src, int size) {
         const char * pos   = src;
         const char * end   = src + size;
         uint32_t     value = 0;
@@ -99,7 +99,7 @@ namespace grammar_parser {
         return pos;
     }
 
-    static auto parse_char(const char * src) -> std::pair<uint32_t, const char *> {
+    static std::pair<uint32_t, const char *> parse_char(const char * src) {
         if (*src == '\\') {
             switch (src[1]) {
                 case 'x': return parse_hex(src + 2, 2);
diff --git a/llama.cpp b/llama.cpp
index cdf7d88c4..374f22795 100644
--- a/llama.cpp
+++ b/llama.cpp
@@ -6819,9 +6819,9 @@ void llama_dump_timing_info_yaml(FILE * stream, const llama_context * ctx) {
 }
 
 // For internal test use
-auto llama_internal_get_tensor_map(struct llama_context * ctx)
-    -> const std::vector<std::pair<std::string, struct ggml_tensor *>> &
-{
+const std::vector<std::pair<std::string, struct ggml_tensor *>> & llama_internal_get_tensor_map(
+    struct llama_context * ctx
+) {
     return ctx->model.tensors_by_name;
 }
 
diff --git a/llama.h b/llama.h
index f494a83f1..c6ee038c7 100644
--- a/llama.h
+++ b/llama.h
@@ -540,8 +540,9 @@ extern "C" {
 
 struct ggml_tensor;
 
-auto llama_internal_get_tensor_map(struct llama_context * ctx)
-    -> const std::vector<std::pair<std::string, struct ggml_tensor *>> &;
+const std::vector<std::pair<std::string, struct ggml_tensor *>> & llama_internal_get_tensor_map(
+    struct llama_context * ctx
+);
 
 #endif // LLAMA_API_INTERNAL