diff --git a/thread.c b/thread.c
index 73d60b0fe3..16f3e1ffed 100644
--- a/thread.c
+++ b/thread.c
@@ -1210,14 +1210,14 @@ COMPILER_WARNING_IGNORED(-Wimplicit-int-float-conversion)
 /* C4305: 'initializing': truncation from '__int64' to 'const double' */
 COMPILER_WARNING_IGNORED(4305)
 #endif
-static const double TIMESPEC_SEC_MAX_as_doube = TIMESPEC_SEC_MAX;
+static const double TIMESPEC_SEC_MAX_as_double = TIMESPEC_SEC_MAX;
 COMPILER_WARNING_POP
 
 static rb_hrtime_t *
 double2hrtime(rb_hrtime_t *hrt, double d)
 {
     /* assume timespec.tv_sec has same signedness as time_t */
-    const double TIMESPEC_SEC_MAX_PLUS_ONE = 2.0 * (TIMESPEC_SEC_MAX_as_doube / 2.0 + 1.0);
+    const double TIMESPEC_SEC_MAX_PLUS_ONE = 2.0 * (TIMESPEC_SEC_MAX_as_double / 2.0 + 1.0);
 
     if (TIMESPEC_SEC_MAX_PLUS_ONE <= d) {
         return NULL;