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-rw-r--r--src/classlibnative/float/floatsingle.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/classlibnative/float/floatsingle.cpp b/src/classlibnative/float/floatsingle.cpp
index daf899921e..29fee225e2 100644
--- a/src/classlibnative/float/floatsingle.cpp
+++ b/src/classlibnative/float/floatsingle.cpp
@@ -12,7 +12,7 @@
#define IS_FLT_INFINITY(x) (((*((INT32*)((void*)&x))) & 0x7FFFFFFF) == 0x7F800000)
// Windows x86 and Windows ARM don't define _isnanf() but they do define a generic macro isnan()
-#if (defined(_TARGET_X86_) || defined(_TARGET_ARM_)) && !defined(FEATURE_PAL) && !defined(_isnanf)
+#if (defined(_TARGET_X86_) || defined(_TARGET_ARM_) || defined(_TARGET_ARM64_)) && !defined(FEATURE_PAL) && !defined(_isnanf)
#define _isnanf isnan
#endif