diff --git a/Makefile b/Makefile
index 29a4e3c..9111e4e 100755
--- a/Makefile
+++ b/Makefile
@@ -346,7 +346,7 @@ endif
 CC       := $(CLANGPATH)clang
 
 #CFLAGS   += -O0
-CFLAGS   += -O3 -Os -Wno-format-invalid-specifier -Wno-format-extra-args
+CFLAGS   += -Oz -Wno-format-invalid-specifier -Wno-format-extra-args
 
 AS     := $(GCCPATH)arm-none-eabi-gcc
 
diff --git a/src_common/ethUtils.h b/src_common/ethUtils.h
index de51b1c..2f66b29 100644
--- a/src_common/ethUtils.h
+++ b/src_common/ethUtils.h
@@ -63,7 +63,7 @@ bool adjustDecimals(char *src,
                     uint32_t targetLength,
                     uint8_t decimals);
 
-__attribute__((no_instrument_function)) inline int allzeroes(void *buf, size_t n) {
+static __attribute__((no_instrument_function)) inline int allzeroes(void *buf, size_t n) {
     uint8_t *p = (uint8_t *) buf;
     for (size_t i = 0; i < n; ++i) {
         if (p[i]) {
@@ -72,7 +72,7 @@ __attribute__((no_instrument_function)) inline int allzeroes(void *buf, size_t n
     }
     return 1;
 }
-__attribute__((no_instrument_function)) inline int ismaxint(uint8_t *buf, int n) {
+static __attribute__((no_instrument_function)) inline int ismaxint(uint8_t *buf, int n) {
     for (int i = 0; i < n; ++i) {
         if (buf[i] != 0xff) {
             return 0;
diff --git a/src_common/network.h b/src_common/network.h
index 529cc4f..23bffc1 100644
--- a/src_common/network.h
+++ b/src_common/network.h
@@ -2,9 +2,11 @@
 #include "tokens.h"
 #include "shared_context.h"
 
+#define MAX_NETWORK_TICKER_LEN 8
+
 typedef struct network_info_s {
     const char name[NETWORK_STRING_MAX_SIZE];
-    const char ticker[MAX_TICKER_LEN];
+    const char ticker[MAX_NETWORK_TICKER_LEN];
     uint64_t chain_id;
 } network_info_t;