diff --git a/hyptop/dg_debugfs_lpar.c b/hyptop/dg_debugfs_lpar.c
index b63b9ec5..a675bf9d 100644
--- a/hyptop/dg_debugfs_lpar.c
+++ b/hyptop/dg_debugfs_lpar.c
@@ -55,8 +55,7 @@ struct l_x_sys_hdr {
 
 static inline void l_sys_hdr__sys_name(struct l_x_sys_hdr *hdr, char *name)
 {
-	memcpy(name, hdr->sys_name, LPAR_NAME_LEN);
-	ht_ebcdic_to_ascii(name, LPAR_NAME_LEN);
+	ht_ebcdic_to_ascii(hdr->sys_name, name, LPAR_NAME_LEN);
 	name[LPAR_NAME_LEN] = 0;
 	ht_strstrip(name);
 }
diff --git a/hyptop/dg_debugfs_vm.c b/hyptop/dg_debugfs_vm.c
index 669ddc9f..67235c3c 100644
--- a/hyptop/dg_debugfs_vm.c
+++ b/hyptop/dg_debugfs_vm.c
@@ -245,8 +245,7 @@ static void l_sd_sys_root_fill(struct sd_sys *sys)
 		struct sd_sys *guest;
 
 		guest_name[NAME_LEN] = 0;
-		memcpy(guest_name, data->guest_name, NAME_LEN);
-		ht_ebcdic_to_ascii(guest_name, NAME_LEN);
+		ht_ebcdic_to_ascii(data->guest_name, guest_name, NAME_LEN);
 		ht_strstrip(guest_name);
 
 		guest = sd_sys_get(sys, guest_name);
diff --git a/hyptop/helper.c b/hyptop/helper.c
index 9d5f7eda..7fb70ffe 100644
--- a/hyptop/helper.c
+++ b/hyptop/helper.c
@@ -98,9 +98,15 @@ void *ht_realloc(void *old_ptr, size_t size)
 /*
  * Convert EBCDIC string to ASCII
  */
-void ht_ebcdic_to_ascii(char *inout, size_t len)
+void ht_ebcdic_to_ascii(char *in, char *out, size_t size)
 {
-	iconv(l_iconv_ebcdic_ascii, &inout, &len, &inout, &len);
+	size_t size_out = size;
+	size_t size_in = size;
+	size_t rc;
+
+	rc = iconv(l_iconv_ebcdic_ascii, &in, &size_in, &out, &size_out);
+	if (rc == (size_t) -1)
+		ERR_EXIT_ERRNO("Code page translation EBCDIC-ASCII failed");
 }
 
 /*
diff --git a/hyptop/helper.h b/hyptop/helper.h
index 2d304789..205b48f2 100644
--- a/hyptop/helper.h
+++ b/hyptop/helper.h
@@ -30,7 +30,7 @@ extern char *ht_strstrip(char *str);
 extern char *ht_strdup(const char *str);
 extern void ht_print_head(const char *sys);
 extern void ht_print_help_icon(void);
-extern void ht_ebcdic_to_ascii(char *inout, size_t len);
+extern void ht_ebcdic_to_ascii(char *in, char *out, size_t len);
 extern char *ht_mount_point_get(const char *fs_type);
 extern u64 ht_ext_tod_2_us(void *tod_ext);
 extern void ht_print_time(void);