diff --git a/src/conky.h b/src/conky.h
index 66c7a13e..32d32625 100644
--- a/src/conky.h
+++ b/src/conky.h
@@ -35,6 +35,7 @@
 #if defined(__OpenBSD__)
 #include <sys/sysctl.h>
 #include <sys/sensors.h>
+#include <machine/apmvar.h>
 #endif /* __OpenBSD__ */
 
 #ifdef AUDACIOUS
@@ -563,9 +564,10 @@ kvm_t *kd;
 #endif
 
 #if (defined(__FreeBSD__) || defined(__OpenBSD__)) && (defined(i386) || defined(__i386__))
-#ifdef __FreeBSD__
-int apm_getinfo(int fd, apm_info_t aip);
+#ifdef __OpenBSD__
+typedef struct apm_power_info *apm_info_t;
 #endif
+int apm_getinfo(int fd, apm_info_t aip);
 char *get_apm_adapter(void);
 char *get_apm_battery_life(void);
 char *get_apm_battery_time(void);
diff --git a/src/openbsd.c b/src/openbsd.c
index 3e0d3e9c..a5c05926 100644
--- a/src/openbsd.c
+++ b/src/openbsd.c
@@ -675,9 +675,9 @@ proc_find_top(struct process **cpu, struct process **mem)
 #define	APM_UNKNOWN	255
 
 int
-apm_getinfo(int fd, void *null)
+apm_getinfo(int fd, apm_info_t aip)
 {
-	if (ioctl(fd, APM_IOC_GETPOWER) == -1)
+	if (ioctl(fd, APM_IOC_GETPOWER, aip) == -1)
 		return (-1);
 
 	return (0);