diff --git a/dlls/kernel32/cpu.c b/dlls/kernel32/cpu.c
index 63ca277..10a8e87 100644
--- a/dlls/kernel32/cpu.c
+++ b/dlls/kernel32/cpu.c
@@ -544,7 +544,7 @@ VOID WINAPI GetSystemInfo(
 	}
 	fclose (f);
 	}
-#elif defined (__NetBSD__)
+#elif defined (__NetBSD__) || defined(__OpenBSD__)
         {
              int mib[2];
              int value[2];
@@ -557,31 +557,55 @@ VOID WINAPI GetSystemInfo(
 #ifdef CPU_FPU_PRESENT
              mib[1] = CPU_FPU_PRESENT;
              value[1] = sizeof(int);
-             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0)
+#ifdef __OpenBSD__
+             if (sysctl(mib, 2, value, (size_t *)(value+1), NULL, 0) >= 0) {
+#else
+             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0) {
+#endif
                  if (value) PF[PF_FLOATING_POINT_EMULATED] = FALSE;
                  else       PF[PF_FLOATING_POINT_EMULATED] = TRUE;
+	     }
 #endif
 #ifdef CPU_SSE
              mib[1] = CPU_SSE;   /* this should imply MMX */
              value[1] = sizeof(int);
-             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0)
+#ifdef __OpenBSD__
+             if (sysctl(mib, 2, value, (size_t *)(value+1), NULL, 0) >= 0) {
+#else
+             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0) {
+#endif
                  if (value) PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
+	     }
 #endif
 #ifdef CPU_SSE2
              mib[1] = CPU_SSE2;  /* this should imply MMX */
              value[1] = sizeof(int);
-             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0)
+#ifdef __OpenBSD__
+             if (sysctl(mib, 2, value, (size_t *)(value+1), NULL, 0) >= 0) {
+#else
+             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0) {
+#endif
                  if (value) PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
+	     }
 #endif
              mib[0] = CTL_HW;
              mib[1] = HW_NCPU;
              value[1] = sizeof(int);
-             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0)
+#ifdef __OpenBSD__
+             if (sysctl(mib, 2, value, (size_t *)(value+1), NULL, 0) >= 0) {
+#else
+             if (sysctl(mib, 2, value, value+1, NULL, 0) >= 0) {
+#endif
                  if (value[0] > cachedsi.dwNumberOfProcessors)
                     cachedsi.dwNumberOfProcessors = value[0];
+             }
              mib[1] = HW_MODEL;
              value[1] = 255;
+#ifdef __OpenBSD__
+             if (sysctl(mib, 2, model, (size_t *)(value+1), NULL, 0) >= 0) {
+#else
              if (sysctl(mib, 2, model, value+1, NULL, 0) >= 0) {
+#endif
                   model[value[1]] = '\0'; /* just in case */
                   cpuclass = strstr(model, "-class");
                   if (cpuclass != NULL) {