diff --git a/headers/posix/arch/arm/fenv.h b/headers/posix/arch/arm/fenv.h
index 9047962986..169e61964b 100644
--- a/headers/posix/arch/arm/fenv.h
+++ b/headers/posix/arch/arm/fenv.h
@@ -33,8 +33,8 @@
 #include <sys/types.h>
 #include <SupportDefs.h>
 
-typedef	uint32	fenv_t;
-typedef	uint32	fexcept_t;
+typedef	uint32_t	fenv_t;
+typedef	uint32_t	fexcept_t;
 
 /* Exception flags */
 #define	FE_INVALID	0x0001
diff --git a/headers/posix/arch/ppc/fenv.h b/headers/posix/arch/ppc/fenv.h
index e6658a2bc8..d54245cf36 100644
--- a/headers/posix/arch/ppc/fenv.h
+++ b/headers/posix/arch/ppc/fenv.h
@@ -33,8 +33,8 @@
 #include <sys/types.h>
 #include <SupportDefs.h>
 
-typedef	uint32	fenv_t;
-typedef	uint32	fexcept_t;
+typedef	uint32_t	fenv_t;
+typedef	uint32_t	fexcept_t;
 
 /* Exception flags */
 #define	FE_INEXACT	0x02000000
@@ -95,7 +95,7 @@ extern const fenv_t	__fe_dfl_env;
 union __fpscr {
 	double __d;
 	struct {
-		uint32 __junk;
+		uint32_t __junk;
 		fenv_t __reg;
 	} __bits;
 };
diff --git a/headers/posix/arch/x86/fenv.h b/headers/posix/arch/x86/fenv.h
index 6e32e32e2e..d9fa4d911c 100644
--- a/headers/posix/arch/x86/fenv.h
+++ b/headers/posix/arch/x86/fenv.h
@@ -38,11 +38,11 @@
  * mxcsr into some reserved fields, rather than changing sizeof(fenv_t).
  */
 typedef struct {
-	uint16	__control;
-	uint16  __mxcsr_hi;
-	uint16	__status;
-	uint16  __mxcsr_lo;
-	uint32	__tag;
+	uint16_t	__control;
+	uint16_t  __mxcsr_hi;
+	uint16_t	__status;
+	uint16_t  __mxcsr_lo;
+	uint32_t	__tag;
 	char	__other[16];
 } fenv_t;
 
@@ -53,7 +53,7 @@ typedef struct {
 	(env).__mxcsr_lo = (uint16)(x);			\
 } while (0)
 
-typedef	uint16	fexcept_t;
+typedef	uint16_t	fexcept_t;
 
 /* Exception flags */
 #define	FE_INVALID	0x01
diff --git a/headers/posix/arch/x86_64/fenv.h b/headers/posix/arch/x86_64/fenv.h
index 59732b1d15..76f85e1999 100644
--- a/headers/posix/arch/x86_64/fenv.h
+++ b/headers/posix/arch/x86_64/fenv.h
@@ -34,12 +34,12 @@
 
 typedef struct {
 	struct {
-		uint32	__control;
-		uint32	__status;
-		uint32	__tag;
+		uint32_t	__control;
+		uint32_t	__status;
+		uint32_t	__tag;
 		char		__other[16];
 	} __x87;
-	uint32		__mxcsr;
+	uint32_t		__mxcsr;
 } fenv_t;
 
 typedef	uint16	fexcept_t;