diff --git a/Makefile b/Makefile
index 5a034c8..8003108 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC=gcc
-CFLAGS=-O2 -std=c99 -W -Werror -Wall -Wextra -pedantic -I. 
+CFLAGS=-O2 -std=c89 -W -Werror -Wall -Wextra -pedantic -I. 
 LFLAGS=-lm
 all:
 	$(CC) $(CFLAGS) main.c i2c.c lis3dh.c -o lis3dh $(LFLAGS)
diff --git a/i2c.c b/i2c.c
index 33842a6..bf7e2a0 100644
--- a/i2c.c
+++ b/i2c.c
@@ -38,7 +38,11 @@ int i2c_init(void) {
 
 
 int i2c_read(uint8_t reg, uint8_t *dst, uint32_t size) {
-	uint8_t cmd[2] = {reg, 0x00};
+	uint8_t cmd[2];
+
+	cmd[0] = reg;
+	cmd[1] = 0x00;
+
 	write(fd, cmd, 2);
 	
 	if (read(fd, dst, size) != (ssize_t)size) {
@@ -52,7 +56,10 @@ int i2c_read(uint8_t reg, uint8_t *dst, uint32_t size) {
 
 
 int i2c_write(uint8_t reg, uint8_t value) {
-	uint8_t cmd[2] = {reg, value};
+	uint8_t cmd[2];
+
+	cmd[0] = reg;
+	cmd[1] = value;
 	
 	if (write(fd, cmd, 2) != 2) {
 		fprintf(stderr, "error write()\n");
diff --git a/main.c b/main.c
index 5668ae1..4dd689b 100644
--- a/main.c
+++ b/main.c
@@ -22,6 +22,7 @@ int main() {
 
     lis3dh_t lis;
     struct lis3dh_fifo_data fifo;
+    int i, k;
 
     /* set fn ptrs to rw on bus (i2c or SPI) */
     lis.dev.init = i2c_init;
@@ -47,7 +48,7 @@ int main() {
         quit("configure()", &lis);
     }
 
-    for (int i=0; i<50; i++) {
+    for (i=0; i<50; i++) {
     
         /* poll fifo reg */
         if (lis3dh_poll_fifo(&lis)) {
@@ -59,7 +60,7 @@ int main() {
             quit("read_fifo()", &lis);
         }
 
-        for(int k=0; k<fifo.size; k++) {
+        for(k=0; k<fifo.size; k++) {
             printf("x: %04.04f, y: %04.04f, z: %04.04f mag: %04.04f\n",
                 fifo.x[k], fifo.y[k], fifo.z[k],
                 mag(fifo.x[k], fifo.y[k], fifo.z[k]));