diff --git a/ChangeLog b/ChangeLog
index 243b865aa..e65c977d8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -20,6 +20,7 @@ Bugfix
 Changes
    * Add SSL_MIN_DHM_BYTES configuration parameter in config.h to choose the
      minimum size of Diffie-Hellman parameters accepted by the client.
+   * The PEM parser now accepts a trailing space at end of lines (#226).
 
 = mbed TLS 1.3.11 released 2015-06-04
 
diff --git a/library/pem.c b/library/pem.c
index 68be8fd6d..5060484cc 100644
--- a/library/pem.c
+++ b/library/pem.c
@@ -236,12 +236,14 @@ int pem_read_buffer( pem_context *ctx, const char *header, const char *footer,
         return( POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
 
     s1 += strlen( header );
+    if( *s1 == ' '  ) s1++;
     if( *s1 == '\r' ) s1++;
     if( *s1 == '\n' ) s1++;
     else return( POLARSSL_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 000000000..6faf8cf08
--- /dev/null
+++ b/tests/data_files/server7_trailing_space.crt
@@ -0,0 +1,47 @@
+-----BEGIN CERTIFICATE----- 
+MIIDwjCCAaqgAwIBAgIBEDANBgkqhkiG9w0BAQsFADBIMQswCQYDVQQGEwJOTDER 
+MA8GA1UEChMIUG9sYXJTU0wxJjAkBgNVBAMTHVBvbGFyU1NMIFRlc3QgSW50ZXJt 
+ZWRpYXRlIENBMB4XDTEzMDkyNDE2MTIyNFoXDTIzMDkyMjE2MTIyNFowNDELMAkG 
+A1UEBhMCTkwxETAPBgNVBAoTCFBvbGFyU1NMMRIwEAYDVQQDEwlsb2NhbGhvc3Qw 
+WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXqoZyychmoCRxzrd4Vu96m 
+47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeYBmskr22rlKjyo4GVMIGS 
+MAkGA1UdEwQCMAAwHQYDVR0OBBYEFNIK06V3H85VsFxGoo5zbL+hYCa7MGYGA1Ud 
+IwRfMF2AFDh32Gt3nCh3gotO2BupHveUFrcOoUKkQDA+MQswCQYDVQQGEwJOTDER 
+MA8GA1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0GC 
+AQ4wDQYJKoZIhvcNAQELBQADggIBADRoQ5fHKw+vkl0D3aqLX1XrZidb+25AWbhr 
+FYXdaskN219PrXBL3cV8x5tK6qsPKSyyw1lue80OmhXs/w7PJkOHHUSWRnmTv7lr 
+8Us3Zr/yOF/VVqzdGs7DlOTpyzEBdugI9uar/aCqHDoltN8wOduOoQB9aojYpROj 
++gjlEO0mgt/87XpjYOig1o0jv44QYDQZQzpj1zeIn6WMe6xk9YDwCLMjRIpg++c7 
+QyxvcEJTn80wX1SaEBM2gau97G7bORLMwBVkMT4oSY+iKYgpPpawOnMJbqUP73Dm 
+yfJExDdrW/BbWZ/vKIcSqSZIbkHdkNjUDVHczyVwQxZxzvLFw/B1k9s7jYFsi5eK 
+TNAdXFa4et1H2sd+uhu24GxsjmJioDrftixcgzPVBjDCjH8QWkBEX292WJ58on0e 
+deWLpZUnzPdE1B4rsiPw1Vg28mGgr2O1xgBQr/fx6A+8ItNTzAXbZfEcult9ypwM 
+0b6YDNe5IvdKk8iwz3mof0VNy47K6xoCaE/fxxWkjoXK8x2wfswGeP2QgUzQE93b 
+OtjdHpsG1c7gIVFQmKATyAPUz4vqmezgNRleXU0oL0PYtoCmKQ51UjNMUfmO9xCj 
+VJaNa2iTQ5Dgic+CW4TYAgj5/9g9X3WfwnDNxrZ0UxxawGElczHXqbrNleTtPaKp 
+a8Si6UK5 
+-----END CERTIFICATE----- 
+-----BEGIN CERTIFICATE----- 
+MIIEATCCA4egAwIBAgIBDjAKBggqhkjOPQQDAjA+MQswCQYDVQQGEwJOTDERMA8G 
+A1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0EwHhcN 
+MTMwOTI0MTU1NTE0WhcNMjMwOTIyMTU1NTE0WjBIMQswCQYDVQQGEwJOTDERMA8G 
+A1UEChMIUG9sYXJTU0wxJjAkBgNVBAMTHVBvbGFyU1NMIFRlc3QgSW50ZXJtZWRp 
+YXRlIENBMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAo1Oc8nr6fMTq 
+vowV+CpC55i5BZGFGc50Eb4RLBSRTH1e7JepdFjAVbBtyQRJSiY1ja0tgLQDDKZR 
+wfEI+b4azse460InPHv7C1TN0upXlxuj6m9B1IlP+sBaM7WBC6dVfPO+jVMIxgkF 
+CaBCLhhdK1Fjf8HjkT/PkctWnho8NTwivc9+nqRZjXe/eIcqm5HwjDDhu+gz+o0g 
+Vz9MfZNi1JyCrOyNZcy+cr2QeNnNVGnFq8xTxtu6dLunhpmLFj2mm0Vjwa7Ypj5q 
+AjpqTMtDvqbRuToyoyzajhMNcCAf7gwzIupJJFVdjdtgYAcQwzikwF5HoITJzzJ2 
+qgxF7CmvGZNb7G99mLdLdhtclH3wAQKHYwEGJo7XKyNEuHPQgB+e0cg1SD1HqlAM 
+uCfGGTWQ6me7Bjan3t0NzoTdDq6IpKTesbaY+/9e2xn8DCrhBKLXQMZFDZqUoLYA 
+kGPOEGgvlPnIIXAawouxCaNYEh5Uw871YMSPT28rLdFr49dwYOtDg9foA8hDIW2P 
+d6KXbrZteesvA1nYzEOs+3AjrbT79Md2W8Bz9bqBVNlNOESSqm4kiCJFmslm/6br 
+Np0MSQd+o22PQ4xRtmP6UsTfU0ueiMpYc8TYYhMbfnfFyo4m707ebcflPbBEN2dg 
+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 47eef4113..55f6c0794 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1355,3 +1355,7 @@ x509parse_crt_file:"data_files/server7_pem_space.crt":1
 X509 File parse (all certificates fail)
 depends_on:POLARSSL_ECP_C
 x509parse_crt_file:"data_files/server7_all_space.crt":POLARSSL_ERR_PEM_INVALID_DATA + POLARSSL_ERR_BASE64_INVALID_CHARACTER
+
+X509 File parse (trailing spaces, OK)
+depends_on:POLARSSL_ECP_C:POLARSSL_ECP_DP_SECP256R1_ENABLED
+x509parse_crt_file:"data_files/server7_trailing_space.crt":0