diff --git a/ChangeLog b/ChangeLog
index 245670e..ec6892e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,6 +14,8 @@
      installed (found by Rawi666).
    * Fix compile error with armcc 5 with --gnu option.
 
+Changes
+   * The PEM parser now accepts a trailing space at end of lines (#226).
 
 = mbed TLS 2.0.0 released 2015-07-13
 
diff --git a/library/pem.c b/library/pem.c
index 3ba835b..7c6339c 100644
--- a/library/pem.c
+++ b/library/pem.c
@@ -236,12 +236,14 @@
         return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
 
     s1 += strlen( header );
+    if( *s1 == ' '  ) s1++;
     if( *s1 == '\r' ) s1++;
     if( *s1 == '\n' ) s1++;
     else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
 
     end = s2;
     end += strlen( footer );
+    if( *end == ' '  ) end++;
     if( *end == '\r' ) end++;
     if( *end == '\n' ) end++;
     *use_len = end - data;
diff --git a/tests/data_files/server7_trailing_space.crt b/tests/data_files/server7_trailing_space.crt
new file mode 100644
index 0000000..6faf8cf
--- /dev/null
+++ b/tests/data_files/server7_trailing_space.crt
@@ -0,0 +1,47 @@
+-----BEGIN CERTIFICATE----- 
+MIIDwjCCAaqgAwIBAgIBEDANBgkqhkiG9w0BAQsFADBIMQswCQYDVQQGEwJOTDER 
+MA8GA1UEChMIUG9sYXJTU0wxJjAkBgNVBAMTHVBvbGFyU1NMIFRlc3QgSW50ZXJt 
+ZWRpYXRlIENBMB4XDTEzMDkyNDE2MTIyNFoXDTIzMDkyMjE2MTIyNFowNDELMAkG 
+A1UEBhMCTkwxETAPBgNVBAoTCFBvbGFyU1NMMRIwEAYDVQQDEwlsb2NhbGhvc3Qw 
+WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXqoZyychmoCRxzrd4Vu96m 
+47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeYBmskr22rlKjyo4GVMIGS 
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+MA8GA1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0GC 
+AQ4wDQYJKoZIhvcNAQELBQADggIBADRoQ5fHKw+vkl0D3aqLX1XrZidb+25AWbhr 
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++gjlEO0mgt/87XpjYOig1o0jv44QYDQZQzpj1zeIn6WMe6xk9YDwCLMjRIpg++c7 
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+VJaNa2iTQ5Dgic+CW4TYAgj5/9g9X3WfwnDNxrZ0UxxawGElczHXqbrNleTtPaKp 
+a8Si6UK5 
+-----END CERTIFICATE----- 
+-----BEGIN CERTIFICATE----- 
+MIIEATCCA4egAwIBAgIBDjAKBggqhkjOPQQDAjA+MQswCQYDVQQGEwJOTDERMA8G 
+A1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0EwHhcN 
+MTMwOTI0MTU1NTE0WhcNMjMwOTIyMTU1NTE0WjBIMQswCQYDVQQGEwJOTDERMA8G 
+A1UEChMIUG9sYXJTU0wxJjAkBgNVBAMTHVBvbGFyU1NMIFRlc3QgSW50ZXJtZWRp 
+YXRlIENBMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAo1Oc8nr6fMTq 
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+updQ66cvfCJB0QJt9upafY0lpdV1qUkCAwEAAaOBoDCBnTAdBgNVHQ4EFgQUOHfY 
+a3ecKHeCi07YG6ke95QWtw4wbgYDVR0jBGcwZYAUnW0gJEkBPyvLeLUZvH4kydv7 
+NnyhQqRAMD4xCzAJBgNVBAYTAk5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UE 
+AxMTUG9sYXJzc2wgVGVzdCBFQyBDQYIJAMFD4n5iQ8zoMAwGA1UdEwQFMAMBAf8w 
+CgYIKoZIzj0EAwIDaAAwZQIxAPyE+u+eP7gRrSFjQicmpYg8jiFUCYEowWY2zuOG 
+i1HXYwmpDHfasQ3rNSuf/gHvjwIwbSSjumDk+uYNci/KMELDsD0MFHxZhhBc9Hp9 
+Af5cNR8KhzegznL6amRObGGKmX1F 
+-----END CERTIFICATE----- 
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 6ab4b21..5bd2af4 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1368,3 +1368,7 @@
 X509 File parse (all certificates fail)
 depends_on:MBEDTLS_ECP_C
 x509parse_crt_file:"data_files/server7_all_space.crt":MBEDTLS_ERR_PEM_INVALID_DATA + MBEDTLS_ERR_BASE64_INVALID_CHARACTER
+
+X509 File parse (trailing spaces, OK)
+depends_on:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+x509parse_crt_file:"data_files/server7_trailing_space.crt":0