diff --git a/headers/build/HaikuBuildCompatibility.h b/headers/build/HaikuBuildCompatibility.h
index 7a852d4db9..1eeaf7a77e 100644
--- a/headers/build/HaikuBuildCompatibility.h
+++ b/headers/build/HaikuBuildCompatibility.h
@@ -300,8 +300,13 @@ typedef struct {
 #	define B_PRIdINO		B_PRId64
 #	define B_PRIiINO		B_PRIi64
 	/* time_t */
-#	define B_PRIdTIME		B_PRId32
-#	define B_PRIiTIME		B_PRIi32
+#	if defined(__i386__) && !defined(__x86_64__)
+#		define B_PRIdTIME		B_PRId32
+#		define B_PRIiTIME		B_PRIi32
+#	else
+#		define B_PRIdTIME		B_PRId64
+#		define B_PRIiTIME		B_PRIi64
+#	endif
 #endif	// !B_PRId8
 
 
diff --git a/headers/os/support/SupportDefs.h b/headers/os/support/SupportDefs.h
index db1ce576f0..f2533bb89e 100644
--- a/headers/os/support/SupportDefs.h
+++ b/headers/os/support/SupportDefs.h
@@ -176,8 +176,13 @@ typedef	generic_addr_t			generic_size_t;
 #define B_PRIiINO		B_PRIi64
 
 /* time_t */
-#define B_PRIdTIME		B_PRId32
-#define B_PRIiTIME		B_PRIi32
+#if defined(__i386__) && !defined(__x86_64__)
+#	define B_PRIdTIME	B_PRId32
+#	define B_PRIiTIME	B_PRIi32
+#else
+#	define B_PRIdTIME	B_PRId64
+#	define B_PRIiTIME	B_PRIi64
+#endif
 
 /* bigtime_t */
 #define B_PRIdBIGTIME	B_PRId64
diff --git a/headers/posix/time.h b/headers/posix/time.h
index 08abda28f2..8ee6a61dfa 100644
--- a/headers/posix/time.h
+++ b/headers/posix/time.h
@@ -13,10 +13,15 @@ struct sigevent;	/* defined in <signal.h> */
 
 
 typedef __haiku_int32 clock_t;
-typedef __haiku_int32 time_t;
 typedef __haiku_int32 suseconds_t;
 typedef __haiku_uint32 useconds_t;
 
+#if defined(__i386__) && !defined(__x86_64__)
+typedef __haiku_int32 time_t;
+#else
+typedef __haiku_int64 time_t;
+#endif
+
 
 #define CLOCKS_PER_SEC	1000000
 #define CLK_TCK			CLOCKS_PER_SEC
diff --git a/headers/private/fs_shell/fssh_api_wrapper.h b/headers/private/fs_shell/fssh_api_wrapper.h
index b7dbcfa3fb..233f8b49f7 100644
--- a/headers/private/fs_shell/fssh_api_wrapper.h
+++ b/headers/private/fs_shell/fssh_api_wrapper.h
@@ -1615,8 +1615,13 @@
 #define B_PRIdINO		FSSH_B_PRIdINO
 #define B_PRIiINO		FSSH_B_PRIiINO
 /* time_t */
-#define B_PRIdTIME		FSSH_B_PRId32
-#define B_PRIiTIME		FSSH_B_PRIi32
+#if defined(__i386__) && !defined(__x86_64__)
+#	define B_PRIdTIME		FSSH_B_PRId32
+#	define B_PRIiTIME		FSSH_B_PRIi32
+#else
+#	define B_PRIdTIME		FSSH_B_PRId64
+#	define B_PRIiTIME		FSSH_B_PRIi64
+#endif
 
 
 ////////////////////////////////////////////////////////////////////////////////