diff --git a/src/proj.rs b/src/proj.rs
index 5f80cc5f..1cc1213d 100644
--- a/src/proj.rs
+++ b/src/proj.rs
@@ -8,7 +8,7 @@ use proj_sys::{
     proj_create, proj_create_crs_to_crs, proj_destroy, proj_errno_string, proj_get_area_of_use,
     proj_grid_cache_set_enable, proj_info, proj_normalize_for_visualization, proj_pj_info,
     proj_trans, proj_trans_array, PJconsts, PJ_AREA, PJ_CONTEXT, PJ_COORD, PJ_DIRECTION_PJ_FWD,
-    PJ_DIRECTION_PJ_INV, PJ_INFO, PJ_LP, PJ_XY,
+    PJ_DIRECTION_PJ_INV, PJ_INFO, PJ_LPZT, PJ_XYZT,
 };
 use std::{
     ffi,
@@ -673,11 +673,17 @@ impl Proj {
         // This signals that we wish to project geodetic coordinates.
         // For conversion (i.e. between projected coordinates) you should use
         // PJ_XY {x: , y: }
-        let coords = PJ_LP { lam: c_x, phi: c_y };
+        // We also initialize z and t in case libproj tries to read them.
+        let coords = PJ_LPZT {
+            lam: c_x,
+            phi: c_y,
+            z: 0.0,
+            t: f64::INFINITY,
+        };
         unsafe {
             proj_errno_reset(self.c_proj);
             // PJ_DIRECTION_* determines a forward or inverse projection
-            let trans = proj_trans(self.c_proj, inv, PJ_COORD { lp: coords });
+            let trans = proj_trans(self.c_proj, inv, PJ_COORD { lpzt: coords });
             // output of coordinates uses the PJ_XY struct
             new_x = trans.xy.x;
             new_y = trans.xy.y;
@@ -738,10 +744,19 @@ impl Proj {
         let new_x;
         let new_y;
         let err;
-        let coords = PJ_XY { x: c_x, y: c_y };
+
+        // This doesn't seem strictly correct, but if we set PJ_XY or PJ_LP here, the
+        // other two values remain uninitialized and we can't be sure that libproj
+        // doesn't try to read them. proj_trans_generic does the same thing.
+        let xyzt = PJ_XYZT {
+            x: c_x,
+            y: c_y,
+            z: 0.0,
+            t: f64::INFINITY,
+        };
         unsafe {
             proj_errno_reset(self.c_proj);
-            let trans = proj_trans(self.c_proj, PJ_DIRECTION_PJ_FWD, PJ_COORD { xy: coords });
+            let trans = proj_trans(self.c_proj, PJ_DIRECTION_PJ_FWD, PJ_COORD { xyzt });
             new_x = trans.xy.x;
             new_y = trans.xy.y;
             err = proj_errno(self.c_proj);
@@ -860,7 +875,12 @@ impl Proj {
                 let c_x: c_double = point.x().to_f64().ok_or(ProjError::FloatConversion)?;
                 let c_y: c_double = point.y().to_f64().ok_or(ProjError::FloatConversion)?;
                 Ok(PJ_COORD {
-                    xy: PJ_XY { x: c_x, y: c_y },
+                    xyzt: PJ_XYZT {
+                        x: c_x,
+                        y: c_y,
+                        z: 0.0,
+                        t: f64::INFINITY,
+                    },
                 })
             })
             .collect::<Result<Vec<_>, ProjError>>()?;
@@ -1152,11 +1172,11 @@ mod test {
     fn test_conversion() {
         // Generated by PROJ by specifying "from" and "to" EPSG codes and calling def()
         let projstring = "
-            proj=pipeline step proj=unitconvert xy_in=us-ft 
-            xy_out=m step inv proj=lcc lat_0=32.1666666666667 
-            lon_0=-116.25 lat_1=33.8833333333333 lat_2=32.7833333333333 
-            x_0=2000000.0001016 y_0=500000.0001016 ellps=GRS80 step proj=lcc lat_0=32.1666666666667 
-            lon_0=-116.25 lat_1=33.8833333333333 lat_2=32.7833333333333 x_0=2000000 y_0=500000 
+            proj=pipeline step proj=unitconvert xy_in=us-ft
+            xy_out=m step inv proj=lcc lat_0=32.1666666666667
+            lon_0=-116.25 lat_1=33.8833333333333 lat_2=32.7833333333333
+            x_0=2000000.0001016 y_0=500000.0001016 ellps=GRS80 step proj=lcc lat_0=32.1666666666667
+            lon_0=-116.25 lat_1=33.8833333333333 lat_2=32.7833333333333 x_0=2000000 y_0=500000
             ellps=GRS80
             ";
         let nad83_m = Proj::new(projstring).unwrap();