diff --git a/components/ulp/ulp_riscv/ulp_core/ulp_riscv_print.c b/components/ulp/ulp_riscv/ulp_core/ulp_riscv_print.c
index 713ed6fb86..6b3d55fa13 100644
--- a/components/ulp/ulp_riscv/ulp_core/ulp_riscv_print.c
+++ b/components/ulp/ulp_riscv/ulp_core/ulp_riscv_print.c
@@ -7,7 +7,7 @@
 #include "ulp_riscv_utils.h"
 
 typedef struct {
-    putc_fn_t putc; // Putc function of the underlying driver, e.g. UART
+    putc_fn_t putc_fn; // Putc function of the underlying driver, e.g. UART
     void *putc_ctx; // Context passed to the putc function
 } ulp_riscv_print_ctx_t;
 
@@ -16,12 +16,12 @@ static ulp_riscv_print_ctx_t s_print_ctx;
 void ulp_riscv_print_install(putc_fn_t putc, void * putc_ctx)
 {
     s_print_ctx.putc_ctx = putc_ctx;
-    s_print_ctx.putc = putc;
+    s_print_ctx.putc_fn = putc;
 }
 
 void ulp_riscv_print_str(const char *str)
 {
-    if (!s_print_ctx.putc) {
+    if (!s_print_ctx.putc_fn) {
         return;
     }
 
@@ -29,7 +29,7 @@ void ulp_riscv_print_str(const char *str)
     ULP_RISCV_ENTER_CRITICAL();
 
     for (int i = 0; str[i] != 0; i++) {
-        s_print_ctx.putc(s_print_ctx.putc_ctx, str[i]);
+        s_print_ctx.putc_fn(s_print_ctx.putc_ctx, str[i]);
     }
 
     ULP_RISCV_EXIT_CRITICAL();
@@ -40,7 +40,7 @@ void ulp_riscv_print_hex(int h)
     int x;
     int c;
 
-    if (!s_print_ctx.putc) {
+    if (!s_print_ctx.putc_fn) {
         return;
     }
 
@@ -51,9 +51,9 @@ void ulp_riscv_print_hex(int h)
     for (x = 0; x < 8; x++) {
         c = (h >> 28) & 0xf; // extract the leftmost byte
         if (c < 10) {
-            s_print_ctx.putc(s_print_ctx.putc_ctx, '0' + c);
+            s_print_ctx.putc_fn(s_print_ctx.putc_ctx, '0' + c);
         } else {
-            s_print_ctx.putc(s_print_ctx.putc_ctx, 'a' + c - 10);
+            s_print_ctx.putc_fn(s_print_ctx.putc_ctx, 'a' + c - 10);
         }
         h <<= 4; // move the 2nd leftmost byte to the left, to be extracted next
     }
@@ -66,7 +66,7 @@ void ulp_riscv_print_hex_with_number_of_digits(int h, int number_of_digits)
     int x;
     int c;
 
-    if (!s_print_ctx.putc) {
+    if (!s_print_ctx.putc_fn) {
         return;
     }
 
@@ -86,9 +86,9 @@ void ulp_riscv_print_hex_with_number_of_digits(int h, int number_of_digits)
     for (x = 0; x < number_of_digits; x++) {
         c = (h >> ((number_of_digits - 1) * 4)) & 0xf; // extract the leftmost byte
         if (c < 10) {
-            s_print_ctx.putc(s_print_ctx.putc_ctx, '0' + c);
+            s_print_ctx.putc_fn(s_print_ctx.putc_ctx, '0' + c);
         } else {
-            s_print_ctx.putc(s_print_ctx.putc_ctx, 'a' + c - 10);
+            s_print_ctx.putc_fn(s_print_ctx.putc_ctx, 'a' + c - 10);
         }
         h <<= 4; // move the 2nd leftmost byte to the left, to be extracted next
     }