diff --git a/src/cpu/core_dyn_x86/cache.h b/src/cpu/core_dyn_x86/cache.h
index 9dce4baf..3134da5a 100644
--- a/src/cpu/core_dyn_x86/cache.h
+++ b/src/cpu/core_dyn_x86/cache.h
@@ -137,8 +137,10 @@ public:
 		addr&=4095;
 		if (host_readw(hostmem+addr)==(Bit16u)val) return;
 		host_writew(hostmem+addr,val);
-		if (!*(Bit16u*)&write_map[addr]) {
-			if (active_blocks) return;
+		const uint16_t is_mapped = host_readw(write_map + addr);
+		if (!is_mapped) {
+			if (active_blocks)
+				return;
 			active_count--;
 			if (!active_count) Release();
 			return;
@@ -160,8 +162,10 @@ public:
 		addr&=4095;
 		if (host_readd(hostmem+addr)==(Bit32u)val) return;
 		host_writed(hostmem+addr,val);
-		if (!*(Bit32u*)&write_map[addr]) {
-			if (active_blocks) return;
+		const uint32_t is_mapped = host_readd(write_map + addr);
+		if (!is_mapped) {
+			if (active_blocks)
+				return;
 			active_count--;
 			if (!active_count) Release();
 			return;
@@ -211,7 +215,9 @@ public:
 		}
 		addr&=4095;
 		if (host_readw(hostmem+addr)==(Bit16u)val) return false;
-		if (!*(Bit16u*)&write_map[addr]) {
+
+		const uint16_t is_mapped = host_readw(write_map + addr);
+		if (!is_mapped) {
 			if (!active_blocks) {
 				active_count--;
 				if (!active_count) Release();
@@ -240,7 +246,9 @@ public:
 		}
 		addr&=4095;
 		if (host_readd(hostmem+addr)==(Bit32u)val) return false;
-		if (!*(Bit32u*)&write_map[addr]) {
+
+		const uint32_t is_mapped = host_readd(write_map + addr);
+		if (!is_mapped) {
 			if (!active_blocks) {
 				active_count--;
 				if (!active_count) Release();