diff --git a/net-analyzer/icinga2/icinga2-2.10.5.ebuild b/net-analyzer/icinga2/icinga2-2.10.5.ebuild
index 688e1fd1f38e2..7ac8f150a99cb 100644
--- a/net-analyzer/icinga2/icinga2-2.10.5.ebuild
+++ b/net-analyzer/icinga2/icinga2-2.10.5.ebuild
@@ -63,7 +63,6 @@ src_configure() {
 		-DICINGA2_UNITY_BUILD=FALSE
 		-DCMAKE_VERBOSE_MAKEFILE=ON
 		-DCMAKE_BUILD_TYPE=None
-		-DCMAKE_INSTALL_PREFIX=/usr
 		-DCMAKE_INSTALL_SYSCONFDIR=/etc
 		-DCMAKE_INSTALL_LOCALSTATEDIR=/var
 		-DICINGA2_SYSCONFIGFILE=/etc/conf.d/icinga2
diff --git a/net-analyzer/icinga2/icinga2-2.10.6.ebuild b/net-analyzer/icinga2/icinga2-2.10.6.ebuild
index d287bf41cefe4..366f6b20e82de 100644
--- a/net-analyzer/icinga2/icinga2-2.10.6.ebuild
+++ b/net-analyzer/icinga2/icinga2-2.10.6.ebuild
@@ -62,7 +62,6 @@ src_configure() {
 		-DICINGA2_UNITY_BUILD=FALSE
 		-DCMAKE_VERBOSE_MAKEFILE=ON
 		-DCMAKE_BUILD_TYPE=None
-		-DCMAKE_INSTALL_PREFIX=/usr
 		-DCMAKE_INSTALL_SYSCONFDIR=/etc
 		-DCMAKE_INSTALL_LOCALSTATEDIR=/var
 		-DICINGA2_SYSCONFIGFILE=/etc/conf.d/icinga2
diff --git a/net-analyzer/icinga2/icinga2-2.11.2.ebuild b/net-analyzer/icinga2/icinga2-2.11.2.ebuild
index c01fcf4d1cd54..65f6fb4f7fbb2 100644
--- a/net-analyzer/icinga2/icinga2-2.11.2.ebuild
+++ b/net-analyzer/icinga2/icinga2-2.11.2.ebuild
@@ -62,7 +62,6 @@ src_configure() {
 		-DICINGA2_UNITY_BUILD=FALSE
 		-DCMAKE_VERBOSE_MAKEFILE=ON
 		-DCMAKE_BUILD_TYPE=None
-		-DCMAKE_INSTALL_PREFIX=/usr
 		-DCMAKE_INSTALL_SYSCONFDIR=/etc
 		-DCMAKE_INSTALL_LOCALSTATEDIR=/var
 		-DICINGA2_SYSCONFIGFILE=/etc/conf.d/icinga2
diff --git a/net-analyzer/icinga2/icinga2-9999.ebuild b/net-analyzer/icinga2/icinga2-9999.ebuild
index 39558b4834ec3..1f48b8612c0c9 100644
--- a/net-analyzer/icinga2/icinga2-9999.ebuild
+++ b/net-analyzer/icinga2/icinga2-9999.ebuild
@@ -62,7 +62,6 @@ src_configure() {
 		-DICINGA2_UNITY_BUILD=FALSE
 		-DCMAKE_VERBOSE_MAKEFILE=ON
 		-DCMAKE_BUILD_TYPE=None
-		-DCMAKE_INSTALL_PREFIX=/usr
 		-DCMAKE_INSTALL_SYSCONFDIR=/etc
 		-DCMAKE_INSTALL_LOCALSTATEDIR=/var
 		-DICINGA2_SYSCONFIGFILE=/etc/conf.d/icinga2