diff --git a/compiler-rt/lib/profile/GCDAProfiling.c b/compiler-rt/lib/profile/GCDAProfiling.c
index 41b795c9617a..5cd22c78a8fd 100644
--- a/compiler-rt/lib/profile/GCDAProfiling.c
+++ b/compiler-rt/lib/profile/GCDAProfiling.c
@@ -43,7 +43,7 @@
 
 #if defined(_MSC_VER)
 typedef unsigned int uint32_t;
-typedef unsigned int uint64_t;
+typedef unsigned long long uint64_t;
 #elif I386_FREEBSD
 /* System headers define 'size_t' incorrectly on x64 FreeBSD (prior to
  * FreeBSD 10, r232261) when compiled in 32-bit mode.
diff --git a/compiler-rt/lib/profile/PGOProfiling.c b/compiler-rt/lib/profile/PGOProfiling.c
index 28b1b60cb3c0..e40eb87fc36e 100644
--- a/compiler-rt/lib/profile/PGOProfiling.c
+++ b/compiler-rt/lib/profile/PGOProfiling.c
@@ -22,7 +22,7 @@
 
 #if defined(_MSC_VER)
 typedef unsigned int uint32_t;
-typedef unsigned int uint64_t;
+typedef unsigned long long uint64_t;
 #elif I386_FREEBSD
 /* System headers define 'size_t' incorrectly on x64 FreeBSD (prior to
  * FreeBSD 10, r232261) when compiled in 32-bit mode.