diff --git a/library/aria.c b/library/aria.c
index 924f952834..5e52eea91e 100644
--- a/library/aria.c
+++ b/library/aria.c
@@ -37,11 +37,6 @@
 
 #include "mbedtls/platform_util.h"
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 /* Parameter validation macros */
 #define ARIA_VALIDATE_RET( cond )                                       \
     MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ARIA_BAD_INPUT_DATA )
diff --git a/library/chacha20.c b/library/chacha20.c
index 44d1612bfe..bd0701482c 100644
--- a/library/chacha20.c
+++ b/library/chacha20.c
@@ -36,11 +36,6 @@
 
 #if !defined(MBEDTLS_CHACHA20_ALT)
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 /* Parameter validation macros */
 #define CHACHA20_VALIDATE_RET( cond )                                       \
     MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA )
diff --git a/library/debug.c b/library/debug.c
index 0cc5af8d1c..353b4bf07b 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -30,11 +30,6 @@
 #include <stdio.h>
 #include <string.h>
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 #define DEBUG_BUF_SIZE      512
 
 static int debug_threshold = 0;
diff --git a/library/ecp.c b/library/ecp.c
index 80adc55c8b..ad19e05fb2 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -104,11 +104,6 @@
 #endif
 #endif /* MBEDTLS_ECP_NO_INTERNAL_RNG */
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 #if defined(MBEDTLS_SELF_TEST)
 /*
  * Counts of point addition and doubling, and field multiplications.
diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 2199be6461..47761eef4e 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -38,11 +38,6 @@
 #define ECP_VALIDATE( cond )        \
     MBEDTLS_INTERNAL_VALIDATE( cond )
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 #define ECP_MPI_INIT(s, n, p) {s, (n), (mbedtls_mpi_uint *)(p)}
 
 #define ECP_MPI_INIT_ARRAY(x)   \
diff --git a/library/mps_reader.c b/library/mps_reader.c
index 9af5073cc9..b304db3f42 100644
--- a/library/mps_reader.c
+++ b/library/mps_reader.c
@@ -29,11 +29,6 @@
 
 #include <string.h>
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 #if defined(MBEDTLS_MPS_ENABLE_TRACE)
 static int mbedtls_mps_trace_id = MBEDTLS_MPS_TRACE_BIT_READER;
 #endif /* MBEDTLS_MPS_ENABLE_TRACE */
diff --git a/library/poly1305.c b/library/poly1305.c
index f38f48a457..a1c5b19d8e 100644
--- a/library/poly1305.c
+++ b/library/poly1305.c
@@ -32,11 +32,6 @@
 
 #if !defined(MBEDTLS_POLY1305_ALT)
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
 /* Parameter validation macros */
 #define POLY1305_VALIDATE_RET( cond )                                       \
     MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA )