diff --git a/src/lib/openjp2/libopenjp2.pc.cmake.in b/src/lib/openjp2/libopenjp2.pc.cmake.in
index 62159b00..00fdacd1 100644
--- a/src/lib/openjp2/libopenjp2.pc.cmake.in
+++ b/src/lib/openjp2/libopenjp2.pc.cmake.in
@@ -12,3 +12,4 @@ Version: @OPENJPEG_VERSION@
 Libs: -L${libdir} -lopenjp2
 Libs.private: -lm
 Cflags: -I${includedir}
+Cflags.private: -DOPJ_STATIC
diff --git a/src/lib/openjpip/libopenjpip.pc.cmake.in b/src/lib/openjpip/libopenjpip.pc.cmake.in
index 7c3f29af..183b68ff 100644
--- a/src/lib/openjpip/libopenjpip.pc.cmake.in
+++ b/src/lib/openjpip/libopenjpip.pc.cmake.in
@@ -13,3 +13,4 @@ Requires: libopenjp2
 Libs: -L${libdir} -lopenjpip
 Libs.private: -lm -lcurl -lfcgi -lpthread
 Cflags: -I${includedir}
+Cflags.private: -DOPJ_STATIC