diff --git a/build-backend.xml b/build-backend.xml
index 28c60a03032e..0d814a0cc95f 100644
--- a/build-backend.xml
+++ b/build-backend.xml
@@ -4,7 +4,7 @@
 	<taskdef resource="net/sf/antcontrib/antlib.xml" />
 
 	<!-- oracle oci library has functions declarations without arguments: f() instead of f(void), so it triggers -Wstrict-prototypes warning -->
-	<property name="COMP_FLAGS_ORACLE" value="-g -std=gnu99 -pedantic -Wall -Wextra -Wunused -Wshadow -Wdeclaration-after-statement -Wpointer-arith -Wno-maybe-uninitialized -Wformat -Wmissing-prototypes -Wunreachable-code -Wformat-extra-args -Wno-missing-field-initializers -Wno-missing-field-initializers -Wincompatible-pointer-types -Wfloat-conversion -Wold-style-definition -Wmissing-declarations -Wunused-parameter -Winit-self -Wnested-externs -Wjump-misses-init -Wdangling-else -Wformat-signedness"/>
+	<property name="COMP_FLAGS_ORACLE" value="-g -std=gnu99 -pedantic -Wall -Wextra -Wunused -Wshadow -Wdeclaration-after-statement -Wpointer-arith -Wno-maybe-uninitialized -Wformat -Wmissing-prototypes -Wunreachable-code -Wformat-extra-args -Wno-missing-field-initializers -Wno-missing-field-initializers -Wincompatible-pointer-types -Wnull-dereference -Wold-style-definition -Wmissing-declarations -Wunused-parameter -Winit-self -Wnested-externs -Wjump-misses-init -Wdangling-else -Wformat-signedness"/>
 	<property name="COMP_FLAGS" value="-Wstrict-prototypes ${COMP_FLAGS_ORACLE}"/>
 	<property name="ZBX_BASE_FLAGS" value="--enable-server --enable-agent --enable-proxy --with-libxml2 --with-unixodbc --with-net-snmp --with-ssh2 --with-libevent  --with-ldap  --with-libcurl"/>