diff --git a/configure.ac b/configure.ac
index 1f7f129..c58a00a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ AC_PROG_INSTALL
 
 # Checks for header files.
 AC_HEADER_STDC
-AC_CHECK_HEADERS([malloc.h netinet/in.h stdint.h string.h])
+AC_CHECK_HEADERS([stdlib.h netinet/in.h stdint.h string.h])
 
 found_libxml2=yes
 PKG_CHECK_MODULES(LIBXML2, libxml-2.0, , found_libxml2=no)
diff --git a/src/smpp34_dumpBuf.c b/src/smpp34_dumpBuf.c
index 9d8e1b9..04066e8 100644
--- a/src/smpp34_dumpBuf.c
+++ b/src/smpp34_dumpBuf.c
@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 
diff --git a/src/smpp34_dumpPdu.c b/src/smpp34_dumpPdu.c
index cff0300..13beaf8 100644
--- a/src/smpp34_dumpPdu.c
+++ b/src/smpp34_dumpPdu.c
@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 
diff --git a/src/smpp34_pack.c b/src/smpp34_pack.c
index 0974da6..dd6e28e 100644
--- a/src/smpp34_pack.c
+++ b/src/smpp34_pack.c
@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 
diff --git a/src/smpp34_params.c b/src/smpp34_params.c
index 73943a5..017a1d6 100644
--- a/src/smpp34_params.c
+++ b/src/smpp34_params.c
@@ -21,7 +21,7 @@
  *
  */
 #include <stdio.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <string.h>
 #ifdef __linux__
 #include <stdint.h>
diff --git a/src/smpp34_structs.c b/src/smpp34_structs.c
index f043613..da53c73 100644
--- a/src/smpp34_structs.c
+++ b/src/smpp34_structs.c
@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 
diff --git a/src/smpp34_unpack.c b/src/smpp34_unpack.c
index 9f7934c..ada612f 100644
--- a/src/smpp34_unpack.c
+++ b/src/smpp34_unpack.c
@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>