diff --git a/glm/simd/platform.h b/glm/simd/platform.h
index 6317663a..30e54f33 100644
--- a/glm/simd/platform.h
+++ b/glm/simd/platform.h
@@ -236,7 +236,7 @@
 #define GLM_ARCH_AVX_BIT	(0x00000080)
 #define GLM_ARCH_AVX2_BIT	(0x00000100)
 
-#define GLM_ARCH_UNKNOWED	(0)
+#define GLM_ARCH_UNKNOWN	(0)
 #define GLM_ARCH_X86		(GLM_ARCH_X86_BIT)
 #define GLM_ARCH_SSE		(GLM_ARCH_SSE_BIT | GLM_ARCH_SIMD_BIT | GLM_ARCH_X86)
 #define GLM_ARCH_SSE2		(GLM_ARCH_SSE2_BIT | GLM_ARCH_SSE)