diff --git a/gvsbuild/projects/pycairo.py b/gvsbuild/projects/pycairo.py
index 42592697b..a39c30930 100644
--- a/gvsbuild/projects/pycairo.py
+++ b/gvsbuild/projects/pycairo.py
@@ -12,7 +12,7 @@
 #
 #  You should have received a copy of the GNU General Public License
 #  along with this program; if not, see <http://www.gnu.org/licenses/>.
-
+import sys
 from pathlib import Path
 
 from gvsbuild.utils.base_builders import Meson
@@ -33,7 +33,8 @@ def __init__(self):
         )
 
     def build(self):
-        Meson.build(self)
+        py_dir = Path(sys.executable).parent
+        Meson.build(self, meson_params=f'-Dpython="{py_dir}\\python.exe"')
         cairo_inc = Path(self.builder.gtk_dir) / "include" / "cairo"
         self.builder.mod_env("INCLUDE", str(cairo_inc))
         self.exec_vs(r"%(python_dir)s\python.exe -m build")
diff --git a/gvsbuild/projects/pygobject.py b/gvsbuild/projects/pygobject.py
index 0b3260158..166e4e58d 100644
--- a/gvsbuild/projects/pygobject.py
+++ b/gvsbuild/projects/pygobject.py
@@ -12,7 +12,7 @@
 #
 #  You should have received a copy of the GNU General Public License
 #  along with this program; if not, see <http://www.gnu.org/licenses/>.
-
+import sys
 from pathlib import Path
 
 from gvsbuild.utils.base_builders import Meson
@@ -38,7 +38,8 @@ def __init__(self):
         )
 
     def build(self):
-        Meson.build(self)
+        py_dir = Path(sys.executable).parent
+        Meson.build(self, meson_params=f'-Dpython="{py_dir}\\python.exe"')
         gtk_dir = self.builder.gtk_dir
         add_inc = [
             str(Path(gtk_dir) / "include" / "cairo"),