diff --git a/config_host.mk.in b/config_host.mk.in
index 2ab62f748bd6..deafc48737d3 100644
--- a/config_host.mk.in
+++ b/config_host.mk.in
@@ -382,7 +382,6 @@ export JAVA_TARGET_VER=@JAVA_TARGET_VER@
 export JAWTLIB=@JAWTLIB@
 export JDK=@JDK@
 export JDK_FOR_BUILD=@JDK_FOR_BUILD@
-export JDK_SECURITYMANAGER_DISALLOWED_FOR_BUILD=@JDK_SECURITYMANAGER_DISALLOWED_FOR_BUILD@
 export JFREEREPORT_JAR=@JFREEREPORT_JAR@
 export JITC_PROCESSOR_TYPE=@JITC_PROCESSOR_TYPE@
 JOM=@JOM@
diff --git a/configure.ac b/configure.ac
index b4c4cfecf2e2..37dff9cb0d54 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6236,7 +6236,6 @@ if test "$cross_compiling" = "yes"; then
         JAVA_HOME
         JAVAIFLAGS
         JDK
-        JDK_SECURITYMANAGER_DISALLOWED
         LIBO_BIN_FOLDER
         LIBO_LIB_FOLDER
         LIBO_URE_LIB_FOLDER
@@ -9081,7 +9080,6 @@ dnl ===================================================================
 
 # Whether all the complexity here actually is needed any more or not, no idea.
 
-JDK_SECURITYMANAGER_DISALLOWED=
 MODULAR_JAVA=
 if test "$ENABLE_JAVA" != "" -a "$cross_compiling" != "yes"; then
     _gij_longver=0
@@ -9106,12 +9104,6 @@ if test "$ENABLE_JAVA" != "" -a "$cross_compiling" != "yes"; then
             if test "$_jdk_ver" -lt 10800; then
                 AC_MSG_ERROR([JDK is too old, you need at least 8 ($_jdk_ver < 10800)])
             fi
-            dnl TODO: Presumably, the Security Manager will not merely be disallowed, but be
-            dnl completely removed in some Java version > 18 (see
-            dnl <https://openjdk.java.net/jeps/411> "Deprecate the Security Manager for Removal"):
-            if test "$_jdk_ver" -ge 180000; then
-                JDK_SECURITYMANAGER_DISALLOWED=TRUE
-            fi
 
             JAVA_HOME=`echo $JAVAINTERPRETER | $SED -n "s,//*bin//*java,,p"`
             if test "$_os" = "WINNT"; then
@@ -9421,7 +9413,6 @@ if test "$ENABLE_JAVA" != "" -a "$cross_compiling" != "yes"; then
     JAVA_HOME_FOR_BUILD=$JAVA_HOME
     JAVAIFLAGS_FOR_BUILD=$JAVAIFLAGS
     JDK_FOR_BUILD=$JDK
-    JDK_SECURITYMANAGER_DISALLOWED_FOR_BUILD=$JDK_SECURITYMANAGER_DISALLOWED
 fi
 
 AC_SUBST(JAVACFLAGS)
@@ -9433,7 +9424,6 @@ AC_SUBST(JAVA_HOME)
 AC_SUBST(JAVA_HOME_FOR_BUILD)
 AC_SUBST(JDK)
 AC_SUBST(JDK_FOR_BUILD)
-AC_SUBST(JDK_SECURITYMANAGER_DISALLOWED_FOR_BUILD)
 AC_SUBST(JAVA_SOURCE_VER)
 AC_SUBST(JAVA_TARGET_VER)
 AC_SUBST(MODULAR_JAVA)
diff --git a/external/hsqldb/ExternalProject_hsqldb.mk b/external/hsqldb/ExternalProject_hsqldb.mk
index 4e5c750c7f3c..a3dfcade6b87 100644
--- a/external/hsqldb/ExternalProject_hsqldb.mk
+++ b/external/hsqldb/ExternalProject_hsqldb.mk
@@ -22,8 +22,6 @@ $(call gb_ExternalProject_get_state_target,hsqldb,build) :
 	$(call gb_Trace_StartRange,hsqldb,EXTERNAL)
 	$(call gb_ExternalProject_run,build,\
 		unset MSYS_NO_PATHCONV && JAVA_HOME=$(JAVA_HOME_FOR_BUILD) \
-		$(if $(JDK_SECURITYMANAGER_DISALLOWED_FOR_BUILD), \
-		    ANT_OPTS="$$ANT_OPTS -Djava.security.manager=allow") \
 		$(ICECREAM_RUN) "$(ANT)" \
 			$(if $(verbose),-v,-q) \
 			-f build/build.xml \