diff --git a/hw/i2c.h b/hw/i2c.h
index d3e4352b1ffc040f6602cbf13c2607def4085e1b..68553758c5803a7006a304852325200cc85d2ce0 100644
--- a/hw/i2c.h
+++ b/hw/i2c.h
@@ -68,7 +68,7 @@ void wm8750_dac_dat(void *opaque, uint32_t sample);
 uint32_t wm8750_adc_dat(void *opaque);
 void *wm8750_dac_buffer(void *opaque, int samples);
 void wm8750_dac_commit(void *opaque);
-void wm8750_set_bclk_in(void *opaque, int hz);
+void wm8750_set_bclk_in(void *opaque, int new_hz);
 
 /* ssd0303.c */
 void ssd0303_init(DisplayState *ds, i2c_bus *bus, int address);
diff --git a/hw/rc4030.c b/hw/rc4030.c
index bf440db73e7b3ae6cc02bdb207a1450104327393..0384cf272233d8e86b84ccb792e50e9e066bb227 100644
--- a/hw/rc4030.c
+++ b/hw/rc4030.c
@@ -70,11 +70,11 @@ typedef struct rc4030State
 static void set_next_tick(rc4030State *s)
 {
     qemu_irq_lower(s->timer_irq);
-    uint32_t hz;
+    uint32_t tm_hz;
 
-    hz = 1000 / (s->itr + 1);
+    tm_hz = 1000 / (s->itr + 1);
 
-    qemu_mod_timer(s->periodic_timer, qemu_get_clock(vm_clock) + ticks_per_sec / hz);
+    qemu_mod_timer(s->periodic_timer, qemu_get_clock(vm_clock) + ticks_per_sec / tm_hz);
 }
 
 /* called for accesses to rc4030 */
diff --git a/hw/twl92230.c b/hw/twl92230.c
index ad49eac0d85149706090d038a455c9b3f130380f..ddb6a2165cca97a45de8deb2756d1bf733c351e5 100644
--- a/hw/twl92230.c
+++ b/hw/twl92230.c
@@ -54,7 +54,7 @@ struct menelaus_s {
     struct {
         uint8_t ctrl;
         uint16_t comp;
-        QEMUTimer *hz;
+        QEMUTimer *hz_tm;
         int64_t next;
         struct tm tm;
         struct tm new;
@@ -77,12 +77,12 @@ static inline void menelaus_update(struct menelaus_s *s)
 static inline void menelaus_rtc_start(struct menelaus_s *s)
 {
     s->rtc.next =+ qemu_get_clock(rt_clock);
-    qemu_mod_timer(s->rtc.hz, s->rtc.next);
+    qemu_mod_timer(s->rtc.hz_tm, s->rtc.next);
 }
 
 static inline void menelaus_rtc_stop(struct menelaus_s *s)
 {
-    qemu_del_timer(s->rtc.hz);
+    qemu_del_timer(s->rtc.hz_tm);
     s->rtc.next =- qemu_get_clock(rt_clock);
     if (s->rtc.next < 1)
         s->rtc.next = 1;
@@ -106,7 +106,7 @@ static void menelaus_rtc_hz(void *opaque)
     s->rtc.next_comp --;
     s->rtc.alm_sec --;
     s->rtc.next += 1000;
-    qemu_mod_timer(s->rtc.hz, s->rtc.next);
+    qemu_mod_timer(s->rtc.hz_tm, s->rtc.next);
     if ((s->rtc.ctrl >> 3) & 3) {				/* EVERY */
         menelaus_rtc_update(s);
         if (((s->rtc.ctrl >> 3) & 3) == 1 && !s->rtc.tm.tm_sec)
@@ -886,7 +886,7 @@ i2c_slave *twl92230_init(i2c_bus *bus, qemu_irq irq)
     s->i2c.send = menelaus_tx;
 
     s->irq = irq;
-    s->rtc.hz = qemu_new_timer(rt_clock, menelaus_rtc_hz, s);
+    s->rtc.hz_tm = qemu_new_timer(rt_clock, menelaus_rtc_hz, s);
     s->in = qemu_allocate_irqs(menelaus_gpio_set, s, 3);
     s->pwrbtn = qemu_allocate_irqs(menelaus_pwrbtn_set, s, 1)[0];
 
diff --git a/hw/vga.c b/hw/vga.c
index ca8acfe24ed02c3a5ed7abad55cd647a356b15a0..bd59aae26456f80ee4fa24f276269be5aa98178b 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -169,7 +169,7 @@ static void vga_precise_update_retrace_info(VGAState *s)
     int div2, sldiv2, dots;
     int clocking_mode;
     int clock_sel;
-    const int hz[] = {25175000, 28322000, 25175000, 25175000};
+    const int clk_hz[] = {25175000, 28322000, 25175000, 25175000};
     int64_t chars_per_sec;
     struct vga_precise_retrace *r = &s->retrace_info.precise;
 
@@ -194,7 +194,7 @@ static void vga_precise_update_retrace_info(VGAState *s)
     clock_sel = (s->msr >> 2) & 3;
     dots = (s->msr & 1) ? 8 : 9;
 
-    chars_per_sec = hz[clock_sel] / dots;
+    chars_per_sec = clk_hz[clock_sel] / dots;
 
     htotal_chars <<= clocking_mode;
 
@@ -239,7 +239,7 @@ static void vga_precise_update_retrace_info(VGAState *s)
         div2, sldiv2,
         clocking_mode,
         clock_sel,
-        hz[clock_sel],
+        clk_hz[clock_sel],
         dots,
         r->ticks_per_char
         );
diff --git a/hw/wm8750.c b/hw/wm8750.c
index b175167ad65387ce1e088a4f0fd3454f9c59c255..e35492408caa7f2134db7f36c0c8534205cb192a 100644
--- a/hw/wm8750.c
+++ b/hw/wm8750.c
@@ -723,11 +723,11 @@ uint32_t wm8750_adc_dat(void *opaque)
     return *data;
 }
 
-void wm8750_set_bclk_in(void *opaque, int hz)
+void wm8750_set_bclk_in(void *opaque, int new_hz)
 {
     struct wm8750_s *s = (struct wm8750_s *) opaque;
 
-    s->ext_adc_hz = hz;
-    s->ext_dac_hz = hz;
+    s->ext_adc_hz = new_hz;
+    s->ext_dac_hz = new_hz;
     wm8750_clk_update(s, 1);
 }