diff --git a/src/platform/visualc/config.h b/src/platform/visualc/config.h
index d9e66c87..d28a4629 100644
--- a/src/platform/visualc/config.h
+++ b/src/platform/visualc/config.h
@@ -36,6 +36,9 @@
 /* Define to 1 to use a x86 assembly fpu core */
 #define C_FPU_X86 1
 
+/* Define to 1 to use a unaligned memory access */
+#define C_UNALIGNED_MEMORY 1
+
 /* environ is defined */
 #define ENVIRON_INCLUDED 1