diff --git a/src/secp256k1.c b/src/secp256k1.c
index 47aa6d44fd..37c33d5968 100644
--- a/src/secp256k1.c
+++ b/src/secp256k1.c
@@ -35,28 +35,28 @@
 #ifndef USE_EXTERNAL_DEFAULT_CALLBACKS
 #include <stdlib.h>
 #include <stdio.h>
-static void default_illegal_callback_fn(const char* str, void* data) {
+static void secp256k1_default_illegal_callback_fn(const char* str, void* data) {
     (void)data;
     fprintf(stderr, "[libsecp256k1] illegal argument: %s\n", str);
     abort();
 }
-static void default_error_callback_fn(const char* str, void* data) {
+static void secp256k1_default_error_callback_fn(const char* str, void* data) {
     (void)data;
     fprintf(stderr, "[libsecp256k1] internal consistency check failed: %s\n", str);
     abort();
 }
 #else
-void default_illegal_callback_fn(const char* str, void* data);
-void default_error_callback_fn(const char* str, void* data);
+void secp256k1_default_illegal_callback_fn(const char* str, void* data);
+void secp256k1_default_error_callback_fn(const char* str, void* data);
 #endif
 
 static const secp256k1_callback default_illegal_callback = {
-    default_illegal_callback_fn,
+    secp256k1_default_illegal_callback_fn,
     NULL
 };
 
 static const secp256k1_callback default_error_callback = {
-    default_error_callback_fn,
+    secp256k1_default_error_callback_fn,
     NULL
 };
 
@@ -70,8 +70,8 @@ struct secp256k1_context_struct {
 static const secp256k1_context secp256k1_context_no_precomp_ = {
     { 0 },
     { 0 },
-    { default_illegal_callback_fn, 0 },
-    { default_error_callback_fn, 0 }
+    { secp256k1_default_illegal_callback_fn, 0 },
+    { secp256k1_default_error_callback_fn, 0 }
 };
 const secp256k1_context *secp256k1_context_no_precomp = &secp256k1_context_no_precomp_;
 
@@ -122,7 +122,7 @@ void secp256k1_context_destroy(secp256k1_context* ctx) {
 void secp256k1_context_set_illegal_callback(secp256k1_context* ctx, void (*fun)(const char* message, void* data), const void* data) {
     ARG_CHECK_NO_RETURN(ctx != secp256k1_context_no_precomp);
     if (fun == NULL) {
-        fun = default_illegal_callback_fn;
+        fun = secp256k1_default_illegal_callback_fn;
     }
     ctx->illegal_callback.fn = fun;
     ctx->illegal_callback.data = data;
@@ -131,7 +131,7 @@ void secp256k1_context_set_illegal_callback(secp256k1_context* ctx, void (*fun)(
 void secp256k1_context_set_error_callback(secp256k1_context* ctx, void (*fun)(const char* message, void* data), const void* data) {
     ARG_CHECK_NO_RETURN(ctx != secp256k1_context_no_precomp);
     if (fun == NULL) {
-        fun = default_error_callback_fn;
+        fun = secp256k1_default_error_callback_fn;
     }
     ctx->error_callback.fn = fun;
     ctx->error_callback.data = data;